Initial checkin of the compositor_model_bench tool

This tool simulates the GPU demands of Chromium's GPU-accelerated compositor. In
the current version, we simulate the performance of the existing forward
rendering model; coming changes will prototype a new model.

BUG=None
TEST=self

This is http://codereview.chromium.org/7718020/ with trivial fixes
Original change by Joshua Trask <joshtrask@google.com>

Review URL: http://codereview.chromium.org/7792002
Patch from Joshua Trask <joshtrask@google.com>.

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@98706 0039d316-1c4b-4281-b951-d872f2087c98

65 files changed, 2085 insertions, 0 deletions

diff --git a/gpu/tools/compositor_model_bench/compositor_model_bench.cc b/gpu/tools/compositor_model_bench/compositor_model_bench.cc
new file mode 100644
index 0000000..12942b5
--- /dev/null
+++ b/gpu/tools/compositor_model_bench/compositor_model_bench.cc
@@ -0,0 +1,406 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// This tool is used to benchmark the render model used by the compositor
+
+// Most of this file is derived from the source of the tile_render_bench tool,
+// and has been changed to  support running a sequence of independent
+// simulations for our different render models and test cases.
+
+#include <stdio.h>
+#include <sys/dir.h>
+#include <sys/file.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <X11/keysym.h>
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+
+#include <queue>
+#include <string>
+#include <vector>
+
+#include "base/at_exit.h"
+#include "base/basictypes.h"
+#include "base/command_line.h"
+#include "base/file_path.h"
+#include "base/file_util.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/message_loop.h"
+#include "base/task.h"
+#include "base/time.h"
+
+#include "gpu/tools/compositor_model_bench/render_model_utils.h"
+#include "gpu/tools/compositor_model_bench/render_models.h"
+#include "gpu/tools/compositor_model_bench/render_tree.h"
+
+
+using base::TimeTicks;
+using file_util::CloseFile;
+using file_util::DirectoryExists;
+using file_util::FileEnumerator;
+using file_util::OpenFile;
+using file_util::PathExists;
+using std::queue;
+using std::string;
+
+struct SimulationSpecification {
+  string simulation_name;
+  FilePath input_path;
+  RenderModel model_under_test;
+  TimeTicks simulation_start_time;
+  int frames_rendered;
+};
+
+// Forward declarations
+class Simulator;
+void _process_events(Simulator* sim);
+void _update_loop(Simulator* sim);
+
+class Simulator {
+ public:
+  Simulator(int seconds_per_test, const FilePath& output_path)
+     : running_(false),
+       current_sim_(NULL),
+       output_path_(output_path),
+       seconds_per_test_(seconds_per_test),
+       ALLOW_THIS_IN_INITIALIZER_LIST(method_factory_(this)),
+       display_(NULL),
+       window_(0),
+       gl_context_(NULL),
+       window_width_(WINDOW_WIDTH),
+       window_height_(WINDOW_HEIGHT) {
+  }
+
+  ~Simulator() {
+    // Cleanup GL.
+    glXMakeCurrent(display_, 0, NULL);
+    glXDestroyContext(display_, gl_context_);
+
+    // Destroy window and display.
+    XDestroyWindow(display_, window_);
+    XCloseDisplay(display_);
+  }
+
+  void QueueTest(const FilePath& path) {
+    SimulationSpecification spec;
+
+    // To get a std::string, we'll try to get an ASCII simulation name.
+    // If the name of the file wasn't ASCII, this will give an empty simulation
+    //  name, but that's not really harmful (we'll still warn about it though.)
+    spec.simulation_name = path.BaseName().RemoveExtension().MaybeAsASCII();
+    if (spec.simulation_name == "") {
+      LOG(WARNING) << "Simulation for path " << path.LossyDisplayName() <<
+        " will have a blank simulation name, since the file name isn't ASCII";
+    }
+    spec.input_path = path;
+    spec.model_under_test = ForwardRenderModel;
+    spec.frames_rendered = 0;
+
+    sims_remaining_.push(spec);
+
+    // The following lines are commented out pending the addition
+    // of the new render model once this version gets fully checked in.
+    //
+    //  spec.model_under_test = KDTreeRenderModel;
+    //  sims_remaining_.push(spec);
+  }
+
+  void Run() {
+    if (!sims_remaining_.size()) {
+      LOG(WARNING) << "No configuration files loaded.";
+      return;
+    }
+
+    base::AtExitManager at_exit;
+    MessageLoop loop;
+    if (!InitX11() || !InitGLContext()) {
+      LOG(FATAL) << "Failed to set up GUI.";
+    }
+
+    InitBuffers();
+
+    LOG(INFO) << "Running " << sims_remaining_.size() << " simulations.";
+
+    loop.PostTask(FROM_HERE,
+                  method_factory_.NewRunnableMethod(&Simulator::ProcessEvents));
+    loop.Run();
+  }
+
+  void ProcessEvents() {
+    // Consume all the X events.
+    while (XPending(display_)) {
+      XEvent e;
+      XNextEvent(display_, &e);
+      switch (e.type) {
+        case Expose:
+          UpdateLoop();
+          break;
+        case ConfigureNotify:
+          Resize(e.xconfigure.width, e.xconfigure.height);
+          break;
+        default:
+          break;
+      }
+    }
+  }
+
+  void UpdateLoop() {
+    if (UpdateTestStatus())
+      UpdateCurrentTest();
+  }
+
+ private:
+  // Initialize X11. Returns true if successful. This method creates the
+  // X11 window. Further initialization is done in X11VideoRenderer.
+  bool InitX11() {
+    display_ = XOpenDisplay(NULL);
+    if (!display_) {
+      LOG(FATAL) << "Cannot open display";
+      return false;
+    }
+
+    // Get properties of the screen.
+    int screen = DefaultScreen(display_);
+    int root_window = RootWindow(display_, screen);
+
+    // Creates the window.
+    window_ = XCreateSimpleWindow(display_,
+                                  root_window,
+                                  1,
+                                  1,
+                                  window_width_,
+                                  window_height_,
+                                  0,
+                                  BlackPixel(display_, screen),
+                                  BlackPixel(display_, screen));
+    XStoreName(display_, window_, "Compositor Model Bench");
+
+    XSelectInput(display_, window_,
+                 ExposureMask | KeyPressMask | StructureNotifyMask);
+    XMapWindow(display_, window_);
+
+    XResizeWindow(display_, window_, WINDOW_WIDTH, WINDOW_HEIGHT);
+
+    return true;
+  }
+
+  // Initialize the OpenGL context.
+  bool InitGLContext() {
+    if (!InitializeGLBindings(gfx::kGLImplementationDesktopGL)) {
+      LOG(FATAL) << "InitializeGLBindings failed";
+      return false;
+    }
+
+    XWindowAttributes attributes;
+    XGetWindowAttributes(display_, window_, &attributes);
+    XVisualInfo visual_info_template;
+    visual_info_template.visualid = XVisualIDFromVisual(attributes.visual);
+    int visual_info_count = 0;
+    XVisualInfo* visual_info_list = XGetVisualInfo(display_, VisualIDMask,
+                                                   &visual_info_template,
+                                                   &visual_info_count);
+
+    for (int i = 0; i < visual_info_count && !gl_context_; ++i) {
+      gl_context_ = glXCreateContext(display_, visual_info_list + i, 0,
+                                     True /* Direct rendering */);
+    }
+
+    XFree(visual_info_list);
+    if (!gl_context_) {
+      return false;
+    }
+
+    if (!glXMakeCurrent(display_, window_, gl_context_)) {
+      glXDestroyContext(display_, gl_context_);
+      gl_context_ = NULL;
+      return false;
+    }
+
+    return true;
+  }
+
+  bool InitializeNextTest() {
+    SimulationSpecification& spec = sims_remaining_.front();
+    LOG(INFO) << "Initializing test for " << spec.simulation_name <<
+        "(" << ModelToString(spec.model_under_test) << ")";
+    const FilePath& path = spec.input_path;
+
+    RenderNode* root = NULL;
+    if (!(root = BuildRenderTreeFromFile(path))) {
+      LOG(ERROR) << "Couldn't parse test configuration file " <<
+          path.LossyDisplayName();
+      return false;
+    }
+
+    current_sim_ = ConstructSimulationModel(spec.model_under_test,
+                                            root,
+                                            window_width_,
+                                            window_height_);
+    if (!current_sim_)
+      return false;
+
+    return true;
+  }
+
+  void CleanupCurrentTest() {
+    LOG(INFO) << "Finished test " << sims_remaining_.front().simulation_name;
+
+    delete current_sim_;
+    current_sim_ = NULL;
+  }
+
+  void UpdateCurrentTest() {
+    ++sims_remaining_.front().frames_rendered;
+
+    if (current_sim_)
+      current_sim_->Update();
+
+    glXSwapBuffers(display_, window_);
+
+    XExposeEvent ev = { Expose, 0, 1, display_, window_,
+                        0, 0, WINDOW_WIDTH, WINDOW_HEIGHT, 0 };
+    XSendEvent(display_,
+      window_,
+      False,
+      ExposureMask,
+      reinterpret_cast<XEvent*>(&ev));
+
+    MessageLoop::current()->PostTask(
+        FROM_HERE,
+        method_factory_.NewRunnableMethod(&Simulator::UpdateLoop));
+  }
+
+  void DumpOutput() {
+    LOG(INFO) << "Successfully ran " << sims_completed_.size() << " tests";
+
+    FILE* f = OpenFile(output_path_, "w");
+
+    if (!f) {
+      LOG(ERROR) << "Failed to open output file " <<
+        output_path_.LossyDisplayName();
+      exit(-1);
+    }
+
+    LOG(INFO) << "Writing results to " << output_path_.LossyDisplayName();
+
+    fputs("{\n\t\"results\": [\n", f);
+
+    while (sims_completed_.size()) {
+      SimulationSpecification i = sims_completed_.front();
+      fprintf(f,
+        "\t\t{\"simulation_name\":\"%s\",\n"
+        "\t\t\t\"render_model\":\"%s\",\n"
+        "\t\t\t\"frames_drawn\":%d\n"
+        "\t\t},\n",
+        i.simulation_name.c_str(),
+        ModelToString(i.model_under_test),
+        i.frames_rendered);
+      sims_completed_.pop();
+    }
+
+    fputs("\t]\n}", f);
+    CloseFile(f);
+  }
+
+  bool UpdateTestStatus() {
+    TimeTicks& current_start = sims_remaining_.front().simulation_start_time;
+    base::TimeDelta d = TimeTicks::Now() - current_start;
+    if (!current_start.is_null() && d.InSeconds() > seconds_per_test_) {
+      CleanupCurrentTest();
+      sims_completed_.push(sims_remaining_.front());
+      sims_remaining_.pop();
+    }
+
+    if (sims_remaining_.size() &&
+      sims_remaining_.front().simulation_start_time.is_null()) {
+      while (sims_remaining_.size() && !InitializeNextTest()) {
+        sims_remaining_.pop();
+      }
+      if (sims_remaining_.size()) {
+        sims_remaining_.front().simulation_start_time = TimeTicks::Now();
+      }
+    }
+
+    if (!sims_remaining_.size()) {
+      DumpOutput();
+      MessageLoop::current()->Quit();
+      return false;
+    }
+
+    return true;
+  }
+
+  void Resize(int width, int height) {
+    window_width_ = width;
+    window_height_ = height;
+    if (current_sim_)
+      current_sim_->Resize(window_width_, window_height_);
+  }
+
+  // Simulation task list for this execution
+  bool running_;
+  RenderModelSimulator* current_sim_;
+  queue<SimulationSpecification> sims_remaining_;
+  queue<SimulationSpecification> sims_completed_;
+  FilePath output_path_;
+  // Amount of time to run each simulation
+  int seconds_per_test_;
+  // GUI data
+  ScopedRunnableMethodFactory<Simulator> method_factory_;
+  Display* display_;
+  Window window_;
+  GLXContext gl_context_;
+  int window_width_;
+  int window_height_;
+};
+
+int main(int argc, char* argv[]) {
+  CommandLine::Init(argc, argv);
+  const CommandLine* cl = CommandLine::ForCurrentProcess();
+
+  if (argc != 3 && argc != 4) {
+    LOG(INFO) << "Usage: \n" <<
+      cl->GetProgram().BaseName().LossyDisplayName() <<
+      "--in=[input path] --out=[output path] (duration=[seconds])\n"
+      "The input path specifies either a JSON configuration file or\n"
+      "a directory containing only these files\n"
+      "(if a directory is specified, simulations will be run for\n"
+      "all files in that directory and subdirectories)\n"
+      "The optional duration parameter specifies the (integer)\n"
+      "number of seconds to be spent on each simulation.\n"
+      "Performance measurements for the specified simulation(s) are\n"
+      "written to the output path.";
+    return -1;
+  }
+
+  int seconds_per_test = 1;
+  if (cl->HasSwitch("duration")) {
+    seconds_per_test = atoi(cl->GetSwitchValueASCII("duration").c_str());
+  }
+
+  Simulator sim(seconds_per_test, cl->GetSwitchValuePath("out"));
+  FilePath inPath = cl->GetSwitchValuePath("in");
+
+  if (!PathExists(inPath)) {
+    LOG(FATAL) << "Path does not exist: " << inPath.LossyDisplayName();
+    return -1;
+  }
+
+  if (DirectoryExists(inPath)) {
+    LOG(INFO) << "(input path is a directory)";
+    FileEnumerator dirItr(inPath, true, FileEnumerator::FILES);
+    for (FilePath f = dirItr.Next(); !f.empty(); f = dirItr.Next()) {
+      sim.QueueTest(f);
+    }
+  } else {
+    LOG(INFO) << "(input path is a file)";
+    sim.QueueTest(inPath);
+  }
+
+  sim.Run();
+
+  return 0;
+}
+
diff --git a/gpu/tools/compositor_model_bench/forward_render_model.cc b/gpu/tools/compositor_model_bench/forward_render_model.cc
new file mode 100644
index 0000000..a7098b9
--- /dev/null
+++ b/gpu/tools/compositor_model_bench/forward_render_model.cc
@@ -0,0 +1,70 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "gpu/tools/compositor_model_bench/forward_render_model.h"
+
+#include <cstdlib>
+#include <vector>
+
+#include "gpu/tools/compositor_model_bench/render_model_utils.h"
+
+using std::vector;
+
+class ForwardRenderNodeVisitor : public RenderNodeVisitor {
+ public:
+  ForwardRenderNodeVisitor() {}
+
+  virtual void BeginVisitRenderNode(RenderNode* v) OVERRIDE {
+    NOTREACHED();
+  }
+
+  virtual void BeginVisitCCNode(CCNode* v) OVERRIDE {
+    if (!v->drawsContent())
+      return;
+    ConfigAndActivateShaderForNode(v);
+    DrawQuad(v->width(), v->height());
+  }
+
+  virtual void BeginVisitContentLayerNode(ContentLayerNode* l) OVERRIDE {
+    if (!l->drawsContent())
+      return;
+    ConfigAndActivateShaderForTiling(l);
+    // Now that we capture root layer tiles, a layer without tiles
+    // should not get drawn.
+    for (size_t n = 0; n < l->num_tiles(); ++n) {
+      const Tile* i = l->tile(n);
+      DrawTileQuad(i->texID, i->x, i->y);
+    }
+  }
+};
+
+ForwardRenderSimulator::ForwardRenderSimulator(RenderNode* root,
+                                               int window_width,
+                                               int window_height)
+    : RenderModelSimulator(root) {
+  textures_.reset(new TextureGenerator(root));
+  visitor_.reset(new ForwardRenderNodeVisitor());
+  glViewport(0, 0, window_width, window_height);
+  glDisable(GL_DEPTH_TEST);
+  glDisable(GL_CULL_FACE);
+  glEnable(GL_BLEND);
+  glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+}
+
+ForwardRenderSimulator::~ForwardRenderSimulator() OVERRIDE {
+}
+
+void ForwardRenderSimulator::Update() OVERRIDE {
+  glClearColor(0, 0, 1, 1);
+  glColorMask(true, true, true, true);
+  glClear(GL_COLOR_BUFFER_BIT);
+  glColorMask(true, true, true, false);
+  BeginFrame();
+  root_->Accept(visitor_.get());
+}
+
+void ForwardRenderSimulator::Resize(int width, int height) OVERRIDE {
+  glViewport(0, 0, width, height);
+}
+
diff --git a/gpu/tools/compositor_model_bench/forward_render_model.h b/gpu/tools/compositor_model_bench/forward_render_model.h
new file mode 100644
index 0000000..76590fe
--- /dev/null
+++ b/gpu/tools/compositor_model_bench/forward_render_model.h
@@ -0,0 +1,34 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// A render model simulator for the original model used in Chromium.
+
+#ifndef GPU_TOOLS_COMPOSITOR_MODEL_BENCH_FORWARD_RENDER_MODEL_H_
+#define GPU_TOOLS_COMPOSITOR_MODEL_BENCH_FORWARD_RENDER_MODEL_H_
+
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+#include "gpu/tools/compositor_model_bench/render_model_utils.h"
+#include "gpu/tools/compositor_model_bench/render_models.h"
+
+class ForwardRenderNodeVisitor;
+
+class ForwardRenderSimulator : public RenderModelSimulator {
+ public:
+  explicit ForwardRenderSimulator(RenderNode* root,
+                                  int window_width,
+                                  int window_height);
+  virtual ~ForwardRenderSimulator() OVERRIDE;
+  virtual void Update() OVERRIDE;
+  virtual void Resize(int width, int height) OVERRIDE;
+
+ private:
+  scoped_ptr<ForwardRenderNodeVisitor> visitor_;
+  scoped_ptr<TextureGenerator> textures_;
+
+  DISALLOW_IMPLICIT_CONSTRUCTORS(ForwardRenderSimulator);
+};
+
+#endif  // GPU_TOOLS_COMPOSITOR_MODEL_BENCH_FORWARD_RENDER_MODEL_H_
+
diff --git a/gpu/tools/compositor_model_bench/measuring_confs/YT0.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/YT0.txt.json
new file mode 100644
index 0000000..2ec423f
--- /dev/null
+++ b/gpu/tools/compositor_model_bench/measuring_confs/YT0.txt.json
@@ -0,0 +1 @@
+{"drawsContent": false, "width": 0, "skipsDraw": false, "layerID": 8, "children": [{"drawsContent": true, "width": 1594, "tiles": {"info": [{"y": 0, "x": 0, "texID": 10}, {"y": 0, "x": 1, "texID": 24}, {"y": 0, "x": 2, "texID": 28}, {"y": 0, "x": 3, "texID": 25}, {"y": 0, "x": 4, "texID": 15}, {"y": 0, "x": 5, "texID": 3}, {"y": 0, "x": 6, "texID": 6}, {"y": 1, "x": 0, "texID": 20}, {"y": 1, "x": 1, "texID": 21}, {"y": 1, "x": 2, "texID": 5}, {"y": 1, "x": 3, "texID": 13}, {"y": 1, "x": 4, "texID": 9}, {"y": 1, "x": 5, "texID": 11}, {"y": 1, "x": 6, "texID": 18}, {"y": 2, "x": 0, "texID": 26}, {"y": 2, "x": 1, "texID": 14}, {"y": 2, "x": 2, "texID": 16}, {"y": 2, "x": 3, "texID": 27}, {"y": 2, "x": 4, "texID": 2}, {"y": 2, "x": 5, "texID": 23}, {"y": 2, "x": 6, "texID": 22}, {"y": 3, "x": 0, "texID": 1}, {"y": 3, "x": 1, "texID": 12}, {"y": 3, "x": 2, "texID": 8}, {"y": 3, "x": 3, "texID": 19}, {"y": 3, "x": 4, "texID": 7}, {"y": 3, "x": 5, "texID": 4}, {"y": 3, "x": 6, "texID": 17}, 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diff --git a/gpu/tools/compositor_model_bench/measuring_confs/YT1.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/YT1.txt.json
new file mode 100644
index 0000000..2ec423f
--- /dev/null
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diff --git a/gpu/tools/compositor_model_bench/measuring_confs/YT10.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/YT10.txt.json
new file mode 100644
index 0000000..845e5b1
--- /dev/null
+++ b/gpu/tools/compositor_model_bench/measuring_confs/YT10.txt.json
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diff --git a/gpu/tools/compositor_model_bench/measuring_confs/YT11.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/YT11.txt.json
new file mode 100644
index 0000000..845e5b1
--- /dev/null
+++ b/gpu/tools/compositor_model_bench/measuring_confs/YT11.txt.json
@@ -0,0 +1 @@
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diff --git a/gpu/tools/compositor_model_bench/measuring_confs/YT12.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/YT12.txt.json
new file mode 100644
index 0000000..350cdf6
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diff --git a/gpu/tools/compositor_model_bench/measuring_confs/YT13.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/YT13.txt.json
new file mode 100644
index 0000000..350cdf6
--- /dev/null
+++ b/gpu/tools/compositor_model_bench/measuring_confs/YT13.txt.json
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\ No newline at end of file
diff --git a/gpu/tools/compositor_model_bench/measuring_confs/YT2.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/YT2.txt.json
new file mode 100644
index 0000000..cb4b95a
--- /dev/null
+++ b/gpu/tools/compositor_model_bench/measuring_confs/YT2.txt.json
@@ -0,0 +1 @@
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diff --git a/gpu/tools/compositor_model_bench/measuring_confs/YT3.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/YT3.txt.json
new file mode 100644
index 0000000..cb4b95a
--- /dev/null
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diff --git a/gpu/tools/compositor_model_bench/measuring_confs/YT4.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/YT4.txt.json
new file mode 100644
index 0000000..3afc30f
--- /dev/null
+++ b/gpu/tools/compositor_model_bench/measuring_confs/YT4.txt.json
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/gpu/tools/compositor_model_bench/measuring_confs/YT5.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/YT5.txt.json
new file mode 100644
index 0000000..3afc30f
--- /dev/null
+++ b/gpu/tools/compositor_model_bench/measuring_confs/YT5.txt.json
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diff --git a/gpu/tools/compositor_model_bench/measuring_confs/YT6.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/YT6.txt.json
new file mode 100644
index 0000000..1af61c0
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diff --git a/gpu/tools/compositor_model_bench/measuring_confs/YT7.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/YT7.txt.json
new file mode 100644
index 0000000..1af61c0
--- /dev/null
+++ b/gpu/tools/compositor_model_bench/measuring_confs/YT7.txt.json
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/gpu/tools/compositor_model_bench/measuring_confs/YT8.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/YT8.txt.json
new file mode 100644
index 0000000..75f4d26
--- /dev/null
+++ b/gpu/tools/compositor_model_bench/measuring_confs/YT8.txt.json
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diff --git a/gpu/tools/compositor_model_bench/measuring_confs/YT9.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/YT9.txt.json
new file mode 100644
index 0000000..75f4d26
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diff --git a/gpu/tools/compositor_model_bench/measuring_confs/YT_special0.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/YT_special0.txt.json
new file mode 100644
index 0000000..3daf2ec
--- /dev/null
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diff --git a/gpu/tools/compositor_model_bench/measuring_confs/YT_special1.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/YT_special1.txt.json
new file mode 100644
index 0000000..e6b3782
--- /dev/null
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diff --git a/gpu/tools/compositor_model_bench/measuring_confs/YT_special11.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/YT_special11.txt.json
new file mode 100644
index 0000000..33e1b9f
--- /dev/null
+++ b/gpu/tools/compositor_model_bench/measuring_confs/YT_special11.txt.json
@@ -0,0 +1 @@
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diff --git a/gpu/tools/compositor_model_bench/measuring_confs/YT_special12.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/YT_special12.txt.json
new file mode 100644
index 0000000..7f98608a
--- /dev/null
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@@ -0,0 +1 @@
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diff --git a/gpu/tools/compositor_model_bench/measuring_confs/YT_special2.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/YT_special2.txt.json
new file mode 100644
index 0000000..cabe2ed
--- /dev/null
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diff --git a/gpu/tools/compositor_model_bench/measuring_confs/YT_special3.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/YT_special3.txt.json
new file mode 100644
index 0000000..d94359c
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diff --git a/gpu/tools/compositor_model_bench/measuring_confs/YT_special4.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/YT_special4.txt.json
new file mode 100644
index 0000000..01b2de1
--- /dev/null
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diff --git a/gpu/tools/compositor_model_bench/measuring_confs/YT_special5.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/YT_special5.txt.json
new file mode 100644
index 0000000..a248227
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diff --git a/gpu/tools/compositor_model_bench/measuring_confs/YT_special6.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/YT_special6.txt.json
new file mode 100644
index 0000000..17b4c59
--- /dev/null
+++ b/gpu/tools/compositor_model_bench/measuring_confs/YT_special6.txt.json
@@ -0,0 +1 @@
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diff --git a/gpu/tools/compositor_model_bench/measuring_confs/YT_special7.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/YT_special7.txt.json
new file mode 100644
index 0000000..3187a1d
--- /dev/null
+++ b/gpu/tools/compositor_model_bench/measuring_confs/YT_special7.txt.json
@@ -0,0 +1 @@
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diff --git a/gpu/tools/compositor_model_bench/measuring_confs/YT_special8.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/YT_special8.txt.json
new file mode 100644
index 0000000..7f050c3
--- /dev/null
+++ b/gpu/tools/compositor_model_bench/measuring_confs/YT_special8.txt.json
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diff --git a/gpu/tools/compositor_model_bench/measuring_confs/YT_special9.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/YT_special9.txt.json
new file mode 100644
index 0000000..739e147
--- /dev/null
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diff --git a/gpu/tools/compositor_model_bench/measuring_confs/abra0.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/abra0.txt.json
new file mode 100644
index 0000000..63f4cae
--- /dev/null
+++ b/gpu/tools/compositor_model_bench/measuring_confs/abra0.txt.json
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diff --git a/gpu/tools/compositor_model_bench/measuring_confs/abra1.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/abra1.txt.json
new file mode 100644
index 0000000..63f4cae
--- /dev/null
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diff --git a/gpu/tools/compositor_model_bench/measuring_confs/abra2.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/abra2.txt.json
new file mode 100644
index 0000000..504583d8d
--- /dev/null
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@@ -0,0 +1 @@
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diff --git a/gpu/tools/compositor_model_bench/measuring_confs/abra3.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/abra3.txt.json
new file mode 100644
index 0000000..4c1336e
--- /dev/null
+++ b/gpu/tools/compositor_model_bench/measuring_confs/abra3.txt.json
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/gpu/tools/compositor_model_bench/measuring_confs/abra4.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/abra4.txt.json
new file mode 100644
index 0000000..4c1336e
--- /dev/null
+++ b/gpu/tools/compositor_model_bench/measuring_confs/abra4.txt.json
@@ -0,0 +1 @@
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diff --git a/gpu/tools/compositor_model_bench/measuring_confs/abra5.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/abra5.txt.json
new file mode 100644
index 0000000..4c1336e
--- /dev/null
+++ b/gpu/tools/compositor_model_bench/measuring_confs/abra5.txt.json
@@ -0,0 +1 @@
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diff --git a/gpu/tools/compositor_model_bench/measuring_confs/test00_0.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/test00_0.txt.json
new file mode 100644
index 0000000..63f4cae
--- /dev/null
+++ b/gpu/tools/compositor_model_bench/measuring_confs/test00_0.txt.json
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/gpu/tools/compositor_model_bench/measuring_confs/test00_1.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/test00_1.txt.json
new file mode 100644
index 0000000..63f4cae
--- /dev/null
+++ b/gpu/tools/compositor_model_bench/measuring_confs/test00_1.txt.json
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/gpu/tools/compositor_model_bench/measuring_confs/test00_2.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/test00_2.txt.json
new file mode 100644
index 0000000..63f4cae
--- /dev/null
+++ b/gpu/tools/compositor_model_bench/measuring_confs/test00_2.txt.json
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/gpu/tools/compositor_model_bench/measuring_confs/test00_3.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/test00_3.txt.json
new file mode 100644
index 0000000..63f4cae
--- /dev/null
+++ b/gpu/tools/compositor_model_bench/measuring_confs/test00_3.txt.json
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/gpu/tools/compositor_model_bench/measuring_confs/test01_0.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/test01_0.txt.json
new file mode 100644
index 0000000..63f4cae
--- /dev/null
+++ b/gpu/tools/compositor_model_bench/measuring_confs/test01_0.txt.json
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/gpu/tools/compositor_model_bench/measuring_confs/test01_1.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/test01_1.txt.json
new file mode 100644
index 0000000..63f4cae
--- /dev/null
+++ b/gpu/tools/compositor_model_bench/measuring_confs/test01_1.txt.json
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/gpu/tools/compositor_model_bench/measuring_confs/test01_2.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/test01_2.txt.json
new file mode 100644
index 0000000..63f4cae
--- /dev/null
+++ b/gpu/tools/compositor_model_bench/measuring_confs/test01_2.txt.json
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/gpu/tools/compositor_model_bench/measuring_confs/test01_3.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/test01_3.txt.json
new file mode 100644
index 0000000..63f4cae
--- /dev/null
+++ b/gpu/tools/compositor_model_bench/measuring_confs/test01_3.txt.json
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/gpu/tools/compositor_model_bench/measuring_confs/test02_0.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/test02_0.txt.json
new file mode 100644
index 0000000..f21ffcc
--- /dev/null
+++ b/gpu/tools/compositor_model_bench/measuring_confs/test02_0.txt.json
@@ -0,0 +1 @@
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diff --git a/gpu/tools/compositor_model_bench/measuring_confs/test02_1.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/test02_1.txt.json
new file mode 100644
index 0000000..f21ffcc
--- /dev/null
+++ b/gpu/tools/compositor_model_bench/measuring_confs/test02_1.txt.json
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/gpu/tools/compositor_model_bench/measuring_confs/test02_2.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/test02_2.txt.json
new file mode 100644
index 0000000..f21ffcc
--- /dev/null
+++ b/gpu/tools/compositor_model_bench/measuring_confs/test02_2.txt.json
@@ -0,0 +1 @@
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diff --git a/gpu/tools/compositor_model_bench/measuring_confs/test02_3.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/test02_3.txt.json
new file mode 100644
index 0000000..f21ffcc
--- /dev/null
+++ b/gpu/tools/compositor_model_bench/measuring_confs/test02_3.txt.json
@@ -0,0 +1 @@
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diff --git a/gpu/tools/compositor_model_bench/measuring_confs/test03_0.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/test03_0.txt.json
new file mode 100644
index 0000000..12d26fe
--- /dev/null
+++ b/gpu/tools/compositor_model_bench/measuring_confs/test03_0.txt.json
@@ -0,0 +1 @@
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diff --git a/gpu/tools/compositor_model_bench/measuring_confs/test03_1.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/test03_1.txt.json
new file mode 100644
index 0000000..12d26fe
--- /dev/null
+++ b/gpu/tools/compositor_model_bench/measuring_confs/test03_1.txt.json
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/gpu/tools/compositor_model_bench/measuring_confs/test03_2.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/test03_2.txt.json
new file mode 100644
index 0000000..12d26fe
--- /dev/null
+++ b/gpu/tools/compositor_model_bench/measuring_confs/test03_2.txt.json
@@ -0,0 +1 @@
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diff --git a/gpu/tools/compositor_model_bench/measuring_confs/test03_3.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/test03_3.txt.json
new file mode 100644
index 0000000..12d26fe
--- /dev/null
+++ b/gpu/tools/compositor_model_bench/measuring_confs/test03_3.txt.json
@@ -0,0 +1 @@
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diff --git a/gpu/tools/compositor_model_bench/measuring_confs/test04_0.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/test04_0.txt.json
new file mode 100644
index 0000000..4c82c82
--- /dev/null
+++ b/gpu/tools/compositor_model_bench/measuring_confs/test04_0.txt.json
@@ -0,0 +1 @@
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diff --git a/gpu/tools/compositor_model_bench/measuring_confs/test04_1.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/test04_1.txt.json
new file mode 100644
index 0000000..4c82c82
--- /dev/null
+++ b/gpu/tools/compositor_model_bench/measuring_confs/test04_1.txt.json
@@ -0,0 +1 @@
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diff --git a/gpu/tools/compositor_model_bench/measuring_confs/test04_2.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/test04_2.txt.json
new file mode 100644
index 0000000..4c82c82
--- /dev/null
+++ b/gpu/tools/compositor_model_bench/measuring_confs/test04_2.txt.json
@@ -0,0 +1 @@
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diff --git a/gpu/tools/compositor_model_bench/measuring_confs/test04_3.txt.json b/gpu/tools/compositor_model_bench/measuring_confs/test04_3.txt.json
new file mode 100644
index 0000000..4c82c82
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0.0, 0.0, 0.0, 0.0, 1.0], "targetSurfaceID": 8, "height": 0}], "type": "ContentLayer", "transform": [1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 804.5, 496.5, 0.0, 1.0], "targetSurfaceID": 8, "height": 993}], "type": "ContentLayer", "transform": [1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0], "targetSurfaceID": 8, "height": 0}
\ No newline at end of file
diff --git a/gpu/tools/compositor_model_bench/render_model_utils.cc b/gpu/tools/compositor_model_bench/render_model_utils.cc
new file mode 100644
index 0000000..a27d59f6
--- /dev/null
+++ b/gpu/tools/compositor_model_bench/render_model_utils.cc
@@ -0,0 +1,176 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Whole-tree processing that's likely to be helpful in multiple render models.
+
+#include "gpu/tools/compositor_model_bench/render_model_utils.h"
+
+#include <cstdlib>
+#include <map>
+#include <set>
+#include <vector>
+
+#include "base/logging.h"
+
+TextureGenerator::TextureGenerator(RenderNode* root)
+    : stage_(DiscoveryStage),
+      tex_ids_(NULL),
+      image_data_(NULL),
+      images_generated_(0) {
+  DiscoverInputIDs(root);
+  GenerateGLTexIDs();
+  AssignIDMapping();
+  WriteOutNewIDs(root);
+  AllocateImageArray();
+  BuildTextureImages(root);
+}
+
+TextureGenerator::~TextureGenerator() OVERRIDE {
+  if (tex_ids_.get()) {
+    glDeleteTextures(discovered_ids_.size(), tex_ids_.get());
+  }
+}
+
+void TextureGenerator::BeginVisitRenderNode(RenderNode* node) OVERRIDE {
+  for (size_t n = 0; n < node->num_tiles(); ++n) {
+    Tile* i = node->tile(n);
+    HandleTexture(&i->texID,
+                  node->tile_width(),
+                  node->tile_height(),
+                  GL_RGBA);
+  }
+}
+
+void TextureGenerator::BeginVisitCCNode(CCNode* node) OVERRIDE {
+  for (size_t n = 0; n < node->num_textures(); ++n) {
+    Texture* i = node->texture(n);
+    HandleTexture(&i->texID, i->width, i->height, i->format);
+  }
+  BeginVisitRenderNode(node);
+}
+
+void TextureGenerator::DiscoverInputIDs(RenderNode* root) {
+  // Pass 1: see which texture ID's have been used.
+  stage_ = DiscoveryStage;
+  root->Accept(this);
+}
+
+void TextureGenerator::GenerateGLTexIDs() {
+  int numTextures = discovered_ids_.size();
+  tex_ids_.reset(new GLuint[numTextures]);
+  glGenTextures(numTextures, tex_ids_.get());
+}
+
+void TextureGenerator::AssignIDMapping() {
+  // In the original version of this code the assigned ID's were not
+  // GL tex ID's, but newly generated consecutive ID's that indexed
+  // into an array of GL tex ID's. There's no need for this and now
+  // I'm instead generating the GL tex ID's upfront and assigning
+  // *those* in the remapping -- this more accurately reflects the
+  // behavior in Chromium, and it also takes out some design
+  // complexity that came from the extra layer of indirection.
+  // HOWEVER -- when I was assigning my own ID's before, I did some
+  // clever tricks to make sure the assignation was idempotent.
+  // Instead of going to even more clever lengths to preserve that
+  // property, I now just assume that the visitor will encounter each
+  // node (and consequently each texture) exactly once during a
+  // traversal of the tree -- this shouldn't be a hard guarantee
+  // to make.
+  int j = 0;
+  typedef std::set<int>::iterator id_itr;
+  for (id_itr i = discovered_ids_.begin();
+       i != discovered_ids_.end();
+       ++i, ++j) {
+    remapped_ids_[*i] = tex_ids_[j];
+  }
+}
+
+void TextureGenerator::WriteOutNewIDs(RenderNode* root) {
+  // Pass 2: write the new texture ID's back into the texture objects.
+  stage_ = RemappingStage;
+  root->Accept(this);
+}
+
+void TextureGenerator::AllocateImageArray() {
+  image_data_.reset(new ImagePtr[discovered_ids_.size()]);
+  images_generated_ = 0;
+}
+
+void TextureGenerator::BuildTextureImages(RenderNode* root) {
+  // Pass 3: use the texture metadata to generate images for the
+  // textures, and set up the textures for use by OpenGL. This
+  // doesn't *have* to be a separate pass (it could be rolled
+  // into pass 2) but I think this is more clear and performance
+  // shouldn't be bad.
+  stage_ = ImageGenerationStage;
+  root->Accept(this);
+}
+
+void TextureGenerator::HandleTexture(int* texID,
+                                     int width,
+                                     int height,
+                                     GLenum format) {
+  if (*texID == -1)
+    return;    // -1 means it's not a real texture.
+  switch (stage_) {
+    case DiscoveryStage:
+      discovered_ids_.insert(*texID);
+      break;
+    case RemappingStage:
+      *texID = remapped_ids_[*texID];
+      break;
+    case ImageGenerationStage:
+      // Only handle this one if we haven't already built a
+      // texture for its ID.
+      if (ids_for_completed_textures_.count(*texID))
+        return;
+      GenerateImageForTexture(*texID, width, height, format);
+      ids_for_completed_textures_.insert(*texID);
+      break;
+  }
+}
+
+void TextureGenerator::GenerateImageForTexture(int texID,
+                                               int width,
+                                               int height,
+                                               GLenum format) {
+  int bytes_per_pixel = FormatBytesPerPixel(format);
+  DCHECK_LE(bytes_per_pixel, 4);
+  int imgID = images_generated_++;
+  image_data_[imgID].reset(new uint8[width*height*bytes_per_pixel]);
+  // Pick random colors to use for this texture.
+  uint8 random_color[4];
+  for (int c = 0; c < 4; ++c) {
+    random_color[c] = std::rand() % 255;
+  }
+  // Create the image from those colors.
+  for (int x = 0; x < width; ++x) {
+    for (int y = 0; y < height; ++y) {
+      int pix_addr = (y * width + x) * bytes_per_pixel;
+      for (int c = 0; c < bytes_per_pixel; ++c) {
+        bool on = ((x/8) + (y/8)) % 2;
+        uint8 v = on ? random_color[c] : ~random_color[c];
+        (image_data_[imgID])[pix_addr + c] = v;
+      }
+      if (bytes_per_pixel == 4) {    // Randomize alpha.
+        image_data_[imgID][pix_addr + 3] = std::rand() % 255;
+      }
+    }
+  }
+  // Set up GL texture.
+  glBindTexture(GL_TEXTURE_2D, texID);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+  glPixelStorei(GL_PACK_ALIGNMENT, 1);
+  glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+  glTexImage2D(GL_TEXTURE_2D,
+               0,
+               format,
+               width, height,
+               0,
+               format,
+               GL_UNSIGNED_BYTE,
+               image_data_[imgID].get());
+}
+
diff --git a/gpu/tools/compositor_model_bench/render_model_utils.h b/gpu/tools/compositor_model_bench/render_model_utils.h
new file mode 100644
index 0000000..8880b42
--- /dev/null
+++ b/gpu/tools/compositor_model_bench/render_model_utils.h
@@ -0,0 +1,62 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Whole-tree processing that's likely to be helpful in multiple render models.
+
+#ifndef GPU_TOOLS_COMPOSITOR_MODEL_BENCH_RENDER_MODEL_UTILS_H_
+#define GPU_TOOLS_COMPOSITOR_MODEL_BENCH_RENDER_MODEL_UTILS_H_
+
+#include <map>
+#include <set>
+#include <vector>
+
+#include "base/compiler_specific.h"
+#include "base/memory/scoped_ptr.h"
+#include "gpu/tools/compositor_model_bench/render_tree.h"
+
+// This is a visitor that runs over the tree structure that was built from the
+// configuration file. It creates OpenGL textures (random checkerboards) that
+// match the specifications of the original textures and overwrites the old
+// texture ID's in the tree, replacing them with the matching new textures.
+class TextureGenerator : public RenderNodeVisitor {
+ public:
+  typedef scoped_array<uint8> ImagePtr;
+  typedef std::vector<Tile>::iterator tile_iter;
+
+  explicit TextureGenerator(RenderNode* root);
+  virtual ~TextureGenerator() OVERRIDE;
+
+  // RenderNodeVisitor functions look for textures and pass them
+  // off to HandleTexture (which behaves appropriately depending
+  // on which pass we are in.)
+  virtual void BeginVisitRenderNode(RenderNode* node) OVERRIDE;
+  virtual void BeginVisitCCNode(CCNode* node) OVERRIDE;
+
+ private:
+  enum TextureGenStage {
+    DiscoveryStage,
+    RemappingStage,
+    ImageGenerationStage
+  };
+
+  void DiscoverInputIDs(RenderNode* root);
+  void GenerateGLTexIDs();
+  void AssignIDMapping();
+  void WriteOutNewIDs(RenderNode* root);
+  void AllocateImageArray();
+  void BuildTextureImages(RenderNode* root);
+  void HandleTexture(int* texID, int width, int height, GLenum format);
+  void GenerateImageForTexture(int texID, int width, int height, GLenum format);
+
+  TextureGenStage stage_;
+  std::set<int> discovered_ids_;
+  scoped_array<GLuint> tex_ids_;
+  std::map<int, int> remapped_ids_;
+  scoped_array<ImagePtr> image_data_;
+  int images_generated_;
+  std::set<int> ids_for_completed_textures_;
+};
+
+#endif  // GPU_TOOLS_COMPOSITOR_MODEL_BENCH_RENDER_MODEL_UTILS_H_
+
diff --git a/gpu/tools/compositor_model_bench/render_models.cc b/gpu/tools/compositor_model_bench/render_models.cc
new file mode 100644
index 0000000..bbbfac6
--- /dev/null
+++ b/gpu/tools/compositor_model_bench/render_models.cc
@@ -0,0 +1,41 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "gpu/tools/compositor_model_bench/render_models.h"
+
+#include <string>
+
+#include "gpu/tools/compositor_model_bench/forward_render_model.h"
+
+const char* ModelToString(RenderModel m) {
+  switch (m) {
+    case ForwardRenderModel:
+      return "Forward Rendering";
+    default:
+      return "(unknown render model name)";
+  }
+}
+
+RenderModelSimulator::RenderModelSimulator(RenderNode* root) : root_(root) {
+}
+
+RenderModelSimulator::~RenderModelSimulator() {
+}
+
+RenderModelSimulator* ConstructSimulationModel(RenderModel model,
+                                               RenderNode* render_tree_root,
+                                               int window_width,
+                                               int window_height) {
+  switch (model) {
+    case ForwardRenderModel:
+      return new ForwardRenderSimulator(render_tree_root,
+                                        window_width,
+                                        window_height);
+    default:
+      LOG(ERROR) << "Unrecognized render model. "
+        "If we know its name, then it's..." << ModelToString(model);
+      return 0;
+  }
+}
+
diff --git a/gpu/tools/compositor_model_bench/render_models.h b/gpu/tools/compositor_model_bench/render_models.h
new file mode 100644
index 0000000..9da592b
--- /dev/null
+++ b/gpu/tools/compositor_model_bench/render_models.h
@@ -0,0 +1,42 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Define the interface for a generic simulation, and a factory method for
+// instantiating different models.
+
+#ifndef GPU_TOOLS_COMPOSITOR_MODEL_BENCH_RENDER_MODELS_H_
+#define GPU_TOOLS_COMPOSITOR_MODEL_BENCH_RENDER_MODELS_H_
+
+#include "gpu/tools/compositor_model_bench/render_tree.h"
+
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+
+enum RenderModel {
+  ForwardRenderModel
+};
+
+const char* ModelToString(RenderModel m);
+
+class RenderModelSimulator {
+ public:
+  virtual ~RenderModelSimulator();
+  virtual void Update() = 0;
+  virtual void Resize(int width, int height) = 0;
+
+ protected:
+  explicit RenderModelSimulator(RenderNode* root);
+  scoped_ptr<RenderNode> root_;
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(RenderModelSimulator);
+};
+
+RenderModelSimulator* ConstructSimulationModel(RenderModel model,
+                                               RenderNode* render_tree_root,
+                                               int window_width,
+                                               int window_height);
+
+#endif  // GPU_TOOLS_COMPOSITOR_MODEL_BENCH_RENDER_MODELS_H_
+
diff --git a/gpu/tools/compositor_model_bench/render_tree.cc b/gpu/tools/compositor_model_bench/render_tree.cc
new file mode 100644
index 0000000..48e7355
--- /dev/null
+++ b/gpu/tools/compositor_model_bench/render_tree.cc
@@ -0,0 +1,442 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "gpu/tools/compositor_model_bench/render_tree.h"
+
+#include <sstream>
+#include <vector>
+
+#include "base/file_path.h"
+#include "base/file_util.h"
+#include "base/json/json_reader.h"
+#include "base/json/json_writer.h"
+#include "base/logging.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/values.h"
+
+#include "gpu/tools/compositor_model_bench/shaders.h"
+
+using base::JSONReader;
+using base::JSONWriter;
+using base::Value;
+using file_util::ReadFileToString;
+using std::string;
+using std::vector;
+
+GLenum TextureFormatFromString(std::string format) {
+  if (format == "RGBA")
+    return GL_RGBA;
+  if (format == "RGB")
+    return GL_RGB;
+  if (format == "LUMINANCE")
+    return GL_LUMINANCE;
+  return GL_INVALID_ENUM;
+}
+
+const char* TextureFormatName(GLenum format) {
+  switch (format) {
+    case GL_RGBA:
+      return "RGBA";
+    case GL_RGB:
+      return "RGB";
+    case GL_LUMINANCE:
+      return "LUMINANCE";
+    default:
+      return "(unknown format)";
+  }
+}
+
+int FormatBytesPerPixel(GLenum format) {
+  switch (format) {
+    case GL_RGBA:
+      return 4;
+    case GL_RGB:
+      return 3;
+    case GL_LUMINANCE:
+      return 1;
+    default:
+      return 0;
+  }
+}
+
+void RenderNode::Accept(RenderNodeVisitor* v) {
+  v->BeginVisitRenderNode(this);
+  v->EndVisitRenderNode(this);
+}
+
+void ContentLayerNode::Accept(RenderNodeVisitor* v) {
+  v->BeginVisitContentLayerNode(this);
+  typedef vector<RenderNode*>::iterator node_itr;
+  for (node_itr i = children_.begin(); i != children_.end(); ++i) {
+    (*i)->Accept(v);
+  }
+  v->EndVisitContentLayerNode(this);
+}
+
+void CCNode::Accept(RenderNodeVisitor* v) {
+  v->BeginVisitCCNode(this);
+  v->EndVisitCCNode(this);
+}
+
+RenderNode* InterpretNode(DictionaryValue* node);
+
+std::string ValueTypeAsString(Value::Type type) {
+  switch (type) {
+    case Value::TYPE_NULL:
+      return "NULL";
+    case Value::TYPE_BOOLEAN:
+      return "BOOLEAN";
+    case Value::TYPE_INTEGER:
+      return "INTEGER";
+    case Value::TYPE_DOUBLE:
+      return "DOUBLE";
+    case Value::TYPE_STRING:
+      return "STRING";
+    case Value::TYPE_BINARY:
+      return "BINARY";
+    case Value::TYPE_DICTIONARY:
+      return "DICTIONARY";
+    case Value::TYPE_LIST:
+      return "LIST";
+    default:
+      return "(UNKNOWN TYPE)";
+  }
+}
+
+// Makes sure that the key exists and has the type we expect.
+bool VerifyDictionaryEntry(DictionaryValue* node,
+                           const std::string& key,
+                           Value::Type type) {
+  if (!node->HasKey(key)) {
+    LOG(ERROR) << "Missing value for key: " << key;
+    return false;
+  }
+
+  Value* child;
+  node->Get(key, &child);
+  if (!child->IsType(type)) {
+    LOG(ERROR) << key << " did not have the expected type "
+      "(expected " << ValueTypeAsString(type) << ")";
+    return false;
+  }
+
+  return true;
+}
+
+// Makes sure that the list entry has the type we expect.
+bool VerifyListEntry(ListValue* l,
+                     int idx,
+                     Value::Type type,
+                     const char* listName = 0) {
+  // Assume the idx is valid (since we'll be able to generate a better
+  // error message for this elsewhere.)
+  Value* el;
+  l->Get(idx, &el);
+  if (!el->IsType(type)) {
+    LOG(ERROR) << (listName ? listName : "List") << "element " << idx <<
+      " did not have the expected type (expected " <<
+      ValueTypeAsString(type) << ")\n";
+    return false;
+  }
+
+  return true;
+}
+
+bool InterpretCommonContents(DictionaryValue* node, RenderNode* c) {
+  if (!VerifyDictionaryEntry(node, "layerID", Value::TYPE_INTEGER) ||
+      !VerifyDictionaryEntry(node, "width", Value::TYPE_INTEGER) ||
+      !VerifyDictionaryEntry(node, "height", Value::TYPE_INTEGER) ||
+      !VerifyDictionaryEntry(node, "drawsContent", Value::TYPE_BOOLEAN) ||
+      !VerifyDictionaryEntry(node, "targetSurfaceID", Value::TYPE_INTEGER) ||
+      !VerifyDictionaryEntry(node, "transform", Value::TYPE_LIST)
+    ) {
+    return false;
+  }
+
+  int layerID;
+  node->GetInteger("layerID", &layerID);
+  c->set_layerID(layerID);
+  int width;
+  node->GetInteger("width", &width);
+  c->set_width(width);
+  int height;
+  node->GetInteger("height", &height);
+  c->set_height(height);
+  bool drawsContent;
+  node->GetBoolean("drawsContent", &drawsContent);
+  c->set_drawsContent(drawsContent);
+  int targetSurface;
+  node->GetInteger("targetSurfaceID", &targetSurface);
+  c->set_targetSurface(targetSurface);
+
+  ListValue* transform;
+  node->GetList("transform", &transform);
+  if (transform->GetSize() != 16) {
+    LOG(ERROR) << "4x4 transform matrix did not have 16 elements";
+    return false;
+  }
+  float transform_mat[16];
+  for (int i = 0; i < 16; ++i) {
+    if (!VerifyListEntry(transform, i, Value::TYPE_DOUBLE, "Transform"))
+      return false;
+    double el;
+    transform->GetDouble(i, &el);
+    transform_mat[i] = el;
+  }
+  c->set_transform(transform_mat);
+
+  if (node->HasKey("tiles")) {
+    if (!VerifyDictionaryEntry(node, "tiles", Value::TYPE_DICTIONARY))
+      return false;
+    DictionaryValue* tiles_dict;
+    node->GetDictionary("tiles", &tiles_dict);
+    if (!VerifyDictionaryEntry(tiles_dict, "dim", Value::TYPE_LIST))
+      return false;
+    ListValue* dim;
+    tiles_dict->GetList("dim", &dim);
+    if (!VerifyListEntry(dim, 0, Value::TYPE_INTEGER, "Tile dimension") ||
+        !VerifyListEntry(dim, 1, Value::TYPE_INTEGER, "Tile dimension")) {
+      return false;
+    }
+    int tile_width;
+    dim->GetInteger(0, &tile_width);
+    c->set_tile_width(tile_width);
+    int tile_height;
+    dim->GetInteger(1, &tile_height);
+    c->set_tile_height(tile_height);
+
+    if (!VerifyDictionaryEntry(tiles_dict, "info", Value::TYPE_LIST))
+      return false;
+    ListValue* tiles;
+    tiles_dict->GetList("info", &tiles);
+    for (unsigned int i = 0; i < tiles->GetSize(); ++i) {
+      if (!VerifyListEntry(tiles, i, Value::TYPE_DICTIONARY, "Tile info"))
+        return false;
+      DictionaryValue* tdict;
+      tiles->GetDictionary(i, &tdict);
+
+      if (!VerifyDictionaryEntry(tdict, "x", Value::TYPE_INTEGER) ||
+          !VerifyDictionaryEntry(tdict, "y", Value::TYPE_INTEGER)) {
+        return false;
+      }
+      Tile t;
+      tdict->GetInteger("x", &t.x);
+      tdict->GetInteger("y", &t.y);
+      if (tdict->HasKey("texID")) {
+        if (!VerifyDictionaryEntry(tdict, "texID", Value::TYPE_INTEGER))
+          return false;
+        tdict->GetInteger("texID", &t.texID);
+      } else {
+        t.texID = -1;
+      }
+      c->add_tile(t);
+    }
+  }
+  return true;
+}
+
+bool InterpretCCData(DictionaryValue* node, CCNode* c) {
+  if (!VerifyDictionaryEntry(node, "vertex_shader", Value::TYPE_STRING) ||
+      !VerifyDictionaryEntry(node, "fragment_shader", Value::TYPE_STRING) ||
+      !VerifyDictionaryEntry(node, "textures", Value::TYPE_LIST)) {
+    return false;
+  }
+  string vertex_shader_name, fragment_shader_name;
+  node->GetString("vertex_shader", &vertex_shader_name);
+  node->GetString("fragment_shader", &fragment_shader_name);
+
+  c->set_vertex_shader(ShaderIDFromString(vertex_shader_name));
+  c->set_fragment_shader(ShaderIDFromString(fragment_shader_name));
+  ListValue* textures;
+  node->GetList("textures", &textures);
+  for (unsigned int i = 0; i < textures->GetSize(); ++i) {
+    if (!VerifyListEntry(textures, i, Value::TYPE_DICTIONARY, "Tex list"))
+      return false;
+    DictionaryValue* tex;
+    textures->GetDictionary(i, &tex);
+
+    if (!VerifyDictionaryEntry(tex, "texID", Value::TYPE_INTEGER) ||
+        !VerifyDictionaryEntry(tex, "height", Value::TYPE_INTEGER) ||
+        !VerifyDictionaryEntry(tex, "width", Value::TYPE_INTEGER) ||
+        !VerifyDictionaryEntry(tex, "format", Value::TYPE_STRING)) {
+      return false;
+    }
+    Texture t;
+    tex->GetInteger("texID", &t.texID);
+    tex->GetInteger("height", &t.height);
+    tex->GetInteger("width", &t.width);
+
+    string formatName;
+    tex->GetString("format", &formatName);
+    t.format = TextureFormatFromString(formatName);
+    if (t.format == GL_INVALID_ENUM) {
+      LOG(ERROR) << "Unrecognized texture format in layer " << c->layerID() <<
+        " (format: " << formatName << ")\n"
+        "The layer had " << textures->GetSize() << " children.";
+      return false;
+    }
+
+    c->add_texture(t);
+  }
+
+  if (c->vertex_shader() == SHADER_UNRECOGNIZED) {
+    LOG(ERROR) << "Unrecognized vertex shader name, layer " << c->layerID() <<
+      " (shader: " << vertex_shader_name << ")";
+    return false;
+  }
+
+  if (c->fragment_shader() == SHADER_UNRECOGNIZED) {
+    LOG(ERROR) << "Unrecognized fragment shader name, layer " << c->layerID() <<
+      " (shader: " << fragment_shader_name << ")";
+    return false;
+  }
+
+  return true;
+}
+
+RenderNode* InterpretContentLayer(DictionaryValue* node) {
+  ContentLayerNode* n = new ContentLayerNode;
+  if (!InterpretCommonContents(node, n))
+    return NULL;
+
+  if (!VerifyDictionaryEntry(node, "type", Value::TYPE_STRING) ||
+      !VerifyDictionaryEntry(node, "skipsDraw", Value::TYPE_BOOLEAN) ||
+      !VerifyDictionaryEntry(node, "children", Value::TYPE_LIST)) {
+    return false;
+  }
+
+  string type;
+  node->GetString("type", &type);
+  DCHECK_EQ(type, "ContentLayer");
+  bool skipsDraw;
+  node->GetBoolean("skipsDraw", &skipsDraw);
+  n->set_skipsDraw(skipsDraw);
+
+  ListValue* children;
+  node->GetList("children", &children);
+  for (unsigned int i = 0; i < children->GetSize(); ++i) {
+    DictionaryValue* childNode;
+    children->GetDictionary(i, &childNode);
+    RenderNode* child = InterpretNode(childNode);
+    if (child)
+      n->add_child(child);
+  }
+
+  return n;
+}
+
+RenderNode* InterpretCanvasLayer(DictionaryValue* node) {
+  CCNode* n = new CCNode;
+  if (!InterpretCommonContents(node, n))
+    return NULL;
+
+  if (!VerifyDictionaryEntry(node, "type", Value::TYPE_STRING)) {
+    return NULL;
+  }
+
+  string type;
+  node->GetString("type", &type);
+  assert(type == "CanvasLayer");
+
+  if (!InterpretCCData(node, n))
+    return NULL;
+
+  return n;
+}
+
+RenderNode* InterpretVideoLayer(DictionaryValue* node) {
+  CCNode* n = new CCNode;
+  if (!InterpretCommonContents(node, n))
+    return NULL;
+
+  if (!VerifyDictionaryEntry(node, "type", Value::TYPE_STRING)) {
+    return NULL;
+  }
+
+  string type;
+  node->GetString("type", &type);
+  assert(type == "VideoLayer");
+
+  if (!InterpretCCData(node, n))
+    return NULL;
+
+  return n;
+}
+
+RenderNode* InterpretImageLayer(DictionaryValue* node) {
+  CCNode* n = new CCNode;
+  if (!InterpretCommonContents(node, n))
+    return NULL;
+
+  if (!VerifyDictionaryEntry(node, "type", Value::TYPE_STRING)) {
+    return NULL;
+  }
+
+  string type;
+  node->GetString("type", &type);
+  assert(type == "ImageLayer");
+
+  if (!InterpretCCData(node, n))
+    return NULL;
+
+  return n;
+}
+
+RenderNode* InterpretNode(DictionaryValue* node) {
+  if (!VerifyDictionaryEntry(node, "type", Value::TYPE_STRING)) {
+    return NULL;
+  }
+
+  string type;
+  node->GetString("type", &type);
+  if (type == "ContentLayer")
+    return InterpretContentLayer(node);
+  if (type == "CanvasLayer")
+    return InterpretCanvasLayer(node);
+  if (type == "VideoLayer")
+    return InterpretVideoLayer(node);
+  if (type == "ImageLayer")
+    return InterpretImageLayer(node);
+
+
+  string outjson;
+  JSONWriter::Write(node, true, &outjson);
+  LOG(ERROR) << "Unrecognized node type! JSON:\n\n"
+      "-----------------------\n" <<
+      outjson <<
+      "-----------------------";
+
+  return NULL;
+}
+
+RenderNode* BuildRenderTreeFromFile(const FilePath& path) {
+  LOG(INFO) << "Reading " << path.LossyDisplayName();
+  string contents;
+  if (!ReadFileToString(path, &contents))
+    return NULL;
+
+  scoped_ptr<Value> root;
+  int error_code = 0;
+  string error_message;
+  root.reset(JSONReader::ReadAndReturnError(contents,
+            true,
+            &error_code,
+            &error_message));
+  if (!root.get()) {
+    LOG(ERROR) << "Failed to parse JSON file " << path.LossyDisplayName() <<
+        "\n(" << error_message << ")";
+    return NULL;
+  }
+
+  if (root->IsType(Value::TYPE_DICTIONARY)) {
+    DictionaryValue* v = static_cast<DictionaryValue*>(root.get());
+    RenderNode* tree = InterpretContentLayer(v);
+    return tree;
+  } else {
+    LOG(ERROR) << path.LossyDisplayName() <<
+        " doesn not encode a JSON dictionary.";
+    return NULL;
+  }
+}
+
diff --git a/gpu/tools/compositor_model_bench/render_tree.h b/gpu/tools/compositor_model_bench/render_tree.h
new file mode 100644
index 0000000..7a4cb7c
--- /dev/null
+++ b/gpu/tools/compositor_model_bench/render_tree.h
@@ -0,0 +1,218 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Data structures for representing parts of Chromium's composited layer tree
+// and a function to load it from the JSON configuration file
+
+#ifndef GPU_TOOLS_COMPOSITOR_MODEL_BENCH_RENDER_TREE_H_
+#define GPU_TOOLS_COMPOSITOR_MODEL_BENCH_RENDER_TREE_H_
+
+#include <string>
+#include <vector>
+
+#include "base/compiler_specific.h"
+#include "base/memory/scoped_vector.h"
+#include "gpu/tools/compositor_model_bench/shaders.h"
+#include "ui/gfx/gl/gl_bindings.h"
+#include "ui/gfx/gl/gl_implementation.h"
+
+// These are fairly arbitrary values based on how big my actual browser
+// window was.
+const int WINDOW_WIDTH = 1609;
+const int WINDOW_HEIGHT = 993;
+
+struct Tile {
+  int x;
+  int y;
+  int texID;
+};
+
+struct Texture {
+  int texID;
+  int height;
+  int width;
+  GLenum format;
+};
+
+GLenum TextureFormatFromString(std::string format);
+const char* TextureFormatName(GLenum format);
+int FormatBytesPerPixel(GLenum format);
+
+struct RenderNodeVisitor;
+
+class RenderNode {
+ public:
+  RenderNode() {}
+  virtual ~RenderNode() {}
+  virtual void Accept(RenderNodeVisitor* v);
+
+  int layerID() {
+    return layerID_;
+  }
+
+  void set_layerID(int id) {
+    layerID_ = id;
+  }
+
+  int width() {
+    return width_;
+  }
+
+  void set_width(int width) {
+    width_ = width;
+  }
+
+  int height() {
+    return height_;
+  }
+
+  void set_height(int height) {
+    height_ = height;
+  }
+
+  bool drawsContent() {
+    return drawsContent_;
+  }
+
+  void set_drawsContent(bool draws) {
+    drawsContent_ = draws;
+  }
+
+  void set_targetSurface(int surface) {
+    targetSurface_ = surface;
+  }
+
+  float* transform() {
+    return transform_;
+  }
+
+  void set_transform(float* mat) {
+    memcpy(reinterpret_cast<void*>(transform_),
+           reinterpret_cast<void*>(mat),
+           16 * sizeof(transform_[0]));
+  }
+
+  void add_tile(Tile t) {
+    tiles_.push_back(t);
+  }
+
+  size_t num_tiles() {
+    return tiles_.size();
+  }
+
+  Tile* tile(size_t index) {
+    return &tiles_[index];
+  }
+
+  int tile_width() {
+    return tile_width_;
+  }
+
+  void set_tile_width(int width) {
+    tile_width_ = width;
+  }
+
+  int tile_height() {
+    return tile_height_;
+  }
+
+  void set_tile_height(int height) {
+    tile_height_ = height;
+  }
+
+ private:
+  int layerID_;
+  int width_;
+  int height_;
+  bool drawsContent_;
+  int targetSurface_;
+  float transform_[16];
+  std::vector<Tile> tiles_;
+  int tile_width_;
+  int tile_height_;
+};
+
+class ContentLayerNode : public RenderNode {
+ public:
+  ContentLayerNode() {}
+  virtual void Accept(RenderNodeVisitor* v) OVERRIDE;
+
+  void set_skipsDraw(bool skips) {
+    skipsDraw_ = skips;
+  }
+
+  void add_child(RenderNode* child) {
+    children_.push_back(child);
+  }
+
+ private:
+  ScopedVector<RenderNode> children_;
+  bool skipsDraw_;
+};
+
+class CCNode : public RenderNode {
+ public:
+  CCNode() {}
+
+  virtual void Accept(RenderNodeVisitor* v) OVERRIDE;
+
+  ShaderID vertex_shader() {
+    return vertex_shader_;
+  }
+
+  void set_vertex_shader(ShaderID shader) {
+    vertex_shader_ = shader;
+  }
+
+  ShaderID fragment_shader() {
+    return fragment_shader_;
+  }
+
+  void set_fragment_shader(ShaderID shader) {
+    fragment_shader_ = shader;
+  }
+
+  void add_texture(Texture t) {
+    textures_.push_back(t);
+  }
+
+  size_t num_textures() {
+    return textures_.size();
+  }
+
+  Texture* texture(size_t index) {
+    return &textures_[index];
+  }
+
+ private:
+  ShaderID vertex_shader_;
+  ShaderID fragment_shader_;
+  std::vector<Texture> textures_;
+};
+
+class RenderNodeVisitor {
+ public:
+  virtual ~RenderNodeVisitor() {}
+
+  virtual void BeginVisitRenderNode(RenderNode* v) = 0;
+  virtual void BeginVisitContentLayerNode(ContentLayerNode* v) {
+    this->BeginVisitRenderNode(v);
+  }
+  virtual void BeginVisitCCNode(CCNode* v) {
+    this->BeginVisitRenderNode(v);
+  }
+
+  virtual void EndVisitRenderNode(RenderNode* v) {}
+  virtual void EndVisitContentLayerNode(ContentLayerNode* v) {
+    this->EndVisitRenderNode(v);
+  }
+  virtual void EndVisitCCNode(CCNode* v) {
+    this->EndVisitRenderNode(v);
+  }
+};
+
+RenderNode* BuildRenderTreeFromFile(const FilePath& path);
+
+#endif  // GPU_TOOLS_COMPOSITOR_MODEL_BENCH_RENDER_TREE_H_
+
diff --git a/gpu/tools/compositor_model_bench/shaders.cc b/gpu/tools/compositor_model_bench/shaders.cc
new file mode 100644
index 0000000..5b8c63b
--- /dev/null
+++ b/gpu/tools/compositor_model_bench/shaders.cc
@@ -0,0 +1,450 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "gpu/tools/compositor_model_bench/shaders.h"
+
+#include <algorithm>
+
+#include "gpu/tools/compositor_model_bench/render_model_utils.h"
+#include "gpu/tools/compositor_model_bench/render_tree.h"
+
+using std::min;
+
+static const int kPositionLocation = 0;
+static const int kTexCoordLocation = 1;
+
+static unsigned g_quad_vertices_vbo;
+static unsigned g_quad_elements_vbo;
+
+// Store a pointer to the transform matrix of the active layer (the complete
+// transform isn't build until we draw the quad; then we can apply
+// translation/scaling/projection)
+static float* g_current_layer_transform;
+
+// In addition to the transform, store other useful information about tiled
+// layers that we'll need to render each tile's quad
+static float g_current_tile_layer_width;
+static float g_current_tile_layer_height;
+static float g_current_tile_width;
+static float g_current_tile_height;
+
+static const float yuv2RGB[9] = {
+  1.164f, 1.164f, 1.164f,
+  0.f, -.391f, 2.018f,
+  1.596f, -.813f, 0.f
+};
+
+// Store shader programs in a sparse array so that they can be addressed easily.
+static int g_program_objects[SHADER_ID_MAX*SHADER_ID_MAX];
+static int g_active_index = -1;
+
+///////////////////////////////////////////////////////////////////////////////
+//              L        R           B          T   N  F
+//      glOrtho(0, WINDOW_WIDTH, WINDOW_HEIGHT, 0, -1, 1);   // column major
+
+static float g_projection_matrix[] = {
+  2.0 / WINDOW_WIDTH, 0.0, 0.0, 0.0,
+  0.0, 2.0 / -WINDOW_HEIGHT, 0.0, 0.0,
+  0.0, 0.0, -1.0, 0.0,
+  -1.0, 1.0, 0.0, 1.0
+};
+
+#define ADDR(i, j) (i*4 + j) /* column major */
+static void Project(const float* v, float* p) {
+  for (int i = 0; i < 4; ++i) {
+    for (int j = 0; j < 4; ++j) {
+      p[ADDR(i, j)] = 0;
+      for (int k = 0; k < 4; ++k) {
+        p[ADDR(i, j)] += g_projection_matrix[ADDR(k, i)] * v[ADDR(j, k)];
+      }
+    }
+  }
+}
+
+static void Scale(const float* in, float* out, float sx, float sy, float sz) {
+  for (int i = 0; i < 4; ++i)
+    out[i] = in[i] * sx;
+  for (int j = 4; j < 8; ++j)
+    out[j] = in[j] * sy;
+  for (int k = 8; k < 12; ++k)
+    out[k] = in[k] * sz;
+  for (int l = 12; l < 16; ++l)
+    out[l] = in[l];
+}
+
+static void TranslateInPlace(float* m, float tx, float ty, float tz) {
+  m[12] += tx;
+  m[13] += ty;
+  m[14] += tz;
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+ShaderID ShaderIDFromString(std::string name) {
+  if (name == "VertexShaderPosTexYUVStretch")
+    return VERTEX_SHADER_POS_TEX_YUV_STRETCH;
+  if (name == "VertexShaderPosTex")
+    return VERTEX_SHADER_POS_TEX;
+  if (name == "VertexShaderPosTexTransform")
+    return VERTEX_SHADER_POS_TEX_TRANSFORM;
+  if (name == "FragmentShaderYUVVideo")
+    return FRAGMENT_SHADER_YUV_VIDEO;
+  if (name == "FragmentShaderRGBATexFlipAlpha")
+    return FRAGMENT_SHADER_RGBA_TEX_FLIP_ALPHA;
+  if (name == "FragmentShaderRGBATexAlpha")
+    return FRAGMENT_SHADER_RGBA_TEX_ALPHA;
+  return SHADER_UNRECOGNIZED;
+}
+
+std::string ShaderNameFromID(ShaderID id) {
+  switch (id) {
+    case VERTEX_SHADER_POS_TEX_YUV_STRETCH:
+      return "VertexShaderPosTexYUVStretch";
+    case VERTEX_SHADER_POS_TEX:
+      return "VertexShaderPosTex";
+    case VERTEX_SHADER_POS_TEX_TRANSFORM:
+      return "VertexShaderPosTexTransform";
+    case FRAGMENT_SHADER_YUV_VIDEO:
+      return "FragmentShaderYUVVideo";
+    case FRAGMENT_SHADER_RGBA_TEX_FLIP_ALPHA:
+      return "FragmentShaderRGBATexFlipAlpha";
+    case FRAGMENT_SHADER_RGBA_TEX_ALPHA:
+      return "FragmentShaderRGBATexAlpha";
+    default:
+      return "(unknown shader)";
+  }
+}
+
+#define SHADER0(Src) #Src
+#define SHADER(Src) SHADER0(Src)
+
+const char* GetShaderSource(ShaderID shader) {
+  switch (shader) {
+    case VERTEX_SHADER_POS_TEX_YUV_STRETCH:
+      return SHADER(
+        #ifdef GL_ES
+        precision mediump float;
+        #endif
+        attribute vec4 a_position;
+        attribute vec2 a_texCoord;
+        uniform mat4 matrix;
+        varying vec2 y_texCoord;
+        varying vec2 uv_texCoord;
+        uniform float y_widthScaleFactor;
+        uniform float uv_widthScaleFactor;
+        void main() {
+          gl_Position = matrix * a_position;
+          y_texCoord = vec2(y_widthScaleFactor * a_texCoord.x,
+            a_texCoord.y);
+          uv_texCoord = vec2(uv_widthScaleFactor * a_texCoord.x,
+            a_texCoord.y);
+        });
+      break;
+    case VERTEX_SHADER_POS_TEX:
+      return SHADER(
+        attribute vec4 a_position;
+        attribute vec2 a_texCoord;
+        uniform mat4 matrix;
+        varying vec2 v_texCoord;
+        void main() {
+          gl_Position = matrix * a_position;
+          v_texCoord = a_texCoord;
+        });
+      break;
+    case VERTEX_SHADER_POS_TEX_TRANSFORM:
+      return SHADER(
+        attribute vec4 a_position;
+        attribute vec2 a_texCoord;
+        uniform mat4 matrix;
+        uniform vec4 texTransform;
+        varying vec2 v_texCoord;
+        void main() {
+          gl_Position = matrix * a_position;
+          v_texCoord = a_texCoord*texTransform.zw + texTransform.xy;
+        });
+      break;
+    case FRAGMENT_SHADER_YUV_VIDEO:
+      return SHADER(
+        #ifdef GL_ES
+        precision mediump float;
+        precision mediump int;
+        #endif
+        varying vec2 y_texCoord;
+        varying vec2 uv_texCoord;
+        uniform sampler2D y_texture;
+        uniform sampler2D u_texture;
+        uniform sampler2D v_texture;
+        uniform float alpha;
+        uniform vec3 yuv_adj;
+        uniform mat3 cc_matrix;
+        void main() {
+          float y_raw = texture2D(y_texture, y_texCoord).x;
+          float u_unsigned = texture2D(u_texture, uv_texCoord).x;
+          float v_unsigned = texture2D(v_texture, uv_texCoord).x;
+          vec3 yuv = vec3(y_raw, u_unsigned, v_unsigned) + yuv_adj;
+          vec3 rgb = cc_matrix * yuv;
+          gl_FragColor = vec4(rgb, 1.0) * alpha;
+        });
+      break;
+    case FRAGMENT_SHADER_RGBA_TEX_FLIP_ALPHA:
+      return SHADER(
+        #ifdef GL_ES
+        precision mediump float;
+        #endif
+        varying vec2 v_texCoord;
+        uniform sampler2D s_texture;
+        uniform float alpha;
+        void main() {
+          vec4 texColor = texture2D(s_texture,
+            vec2(v_texCoord.x, 1.0 - v_texCoord.y));
+          gl_FragColor = vec4(texColor.x,
+            texColor.y,
+            texColor.z,
+            texColor.w) * alpha;
+        });
+      break;
+    case FRAGMENT_SHADER_RGBA_TEX_ALPHA:
+      return SHADER(
+        #ifdef GL_ES
+        precision mediump float;
+        #endif
+        varying vec2 v_texCoord;
+        uniform sampler2D s_texture;
+        uniform float alpha;
+        void main() {
+          vec4 texColor = texture2D(s_texture, v_texCoord);
+          gl_FragColor = texColor * alpha;
+        });
+      break;
+    default:
+      printf("Shader source requested for unknown shader\n");
+      return "";
+  }
+}
+
+int GetProgramIdx(ShaderID v, ShaderID f) {
+  return v * SHADER_ID_MAX + f;
+}
+
+static void ReportAnyShaderCompilationErrors(GLuint shader, ShaderID id) {
+  GLint status;
+  glGetShaderiv(shader, GL_COMPILE_STATUS, &status);
+  if (status)
+    return;
+  // Get the length of the log string
+  GLsizei length;
+  glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &length);
+  scoped_array<GLchar> log(new GLchar[length+1]);
+  glGetShaderInfoLog(shader, length, NULL, log.get());
+  LOG(ERROR) << log.get() << " in shader " << ShaderNameFromID(id);
+}
+
+static int ActivateShader(ShaderID v, ShaderID f, float* layer_transform) {
+  int program_index = GetProgramIdx(v, f);
+  if (!g_program_objects[program_index]) {
+    g_program_objects[program_index] = glCreateProgramObjectARB();
+    GLenum vs = glCreateShaderObjectARB(GL_VERTEX_SHADER);
+    GLenum fs = glCreateShaderObjectARB(GL_FRAGMENT_SHADER);
+    const char* vs_source = GetShaderSource(v);
+    const char* fs_source = GetShaderSource(f);
+    glShaderSourceARB(vs, 1, &vs_source, 0);
+    glShaderSourceARB(fs, 1, &fs_source, 0);
+    glCompileShaderARB(vs);
+    ReportAnyShaderCompilationErrors(vs, v);
+    glCompileShaderARB(fs);
+    ReportAnyShaderCompilationErrors(fs, f);
+    glAttachObjectARB(g_program_objects[program_index], vs);
+    glAttachObjectARB(g_program_objects[program_index], fs);
+    glBindAttribLocationARB(g_program_objects[program_index],
+                            kPositionLocation,
+                            "a_position");
+    glBindAttribLocationARB(g_program_objects[program_index],
+                            kTexCoordLocation,
+                            "a_texCoord");
+    glLinkProgramARB(g_program_objects[program_index]);
+  }
+  if (g_active_index != program_index)
+    glUseProgramObjectARB(g_program_objects[program_index]);
+  g_active_index = program_index;
+
+  g_current_layer_transform = layer_transform;
+
+  return g_program_objects[program_index];
+}
+
+void ConfigAndActivateShaderForNode(CCNode* n) {
+  ShaderID vs = n->vertex_shader();
+  ShaderID fs = n->fragment_shader();
+  float* transform = n->transform();
+  int program = ActivateShader(vs, fs, transform);
+  if (vs == VERTEX_SHADER_POS_TEX_YUV_STRETCH) {
+    GLint y_scale = glGetUniformLocationARB(program, "y_widthScaleFactor");
+    GLint uv_scale = glGetUniformLocationARB(program, "uv_widthScaleFactor");
+    glUniform1fARB(y_scale, 1.0);
+    glUniform1fARB(uv_scale, 1.0);
+  }
+  if (vs == VERTEX_SHADER_POS_TEX_TRANSFORM) {
+    GLint texTrans = glGetUniformLocationARB(program, "texTransform");
+    glUniform4fARB(texTrans, 0.0, 0.0, 0.0, 0.0);
+  }
+  if (fs == FRAGMENT_SHADER_RGBA_TEX_FLIP_ALPHA) {
+    DCHECK_EQ(n->num_textures(), 1u);
+    DCHECK_NE(n->texture(0)->texID, -1);
+    glActiveTexture(GL_TEXTURE0);
+    glBindTexture(GL_TEXTURE_2D, n->texture(0)->texID);
+    int sTexLoc = glGetUniformLocationARB(program, "s_texture");
+    glUniform1iARB(sTexLoc, 0);
+  }
+  if (fs == FRAGMENT_SHADER_YUV_VIDEO) {
+    DCHECK_EQ(n->num_textures(), 3u);
+    DCHECK_NE(n->texture(0)->texID, -1);
+    DCHECK_NE(n->texture(1)->texID, -1);
+    DCHECK_NE(n->texture(2)->texID, -1);
+    // Bind Y tex.
+    glActiveTexture(GL_TEXTURE0);
+    glBindTexture(GL_TEXTURE_2D, n->texture(0)->texID);
+    int yTexLoc = glGetUniformLocationARB(program, "y_texture");
+    glUniform1iARB(yTexLoc, 0);
+    // Bind U tex.
+    glActiveTexture(GL_TEXTURE0 + 1);
+    glBindTexture(GL_TEXTURE_2D, n->texture(1)->texID);
+    int uTexLoc = glGetUniformLocationARB(program, "u_texture");
+    glUniform1iARB(uTexLoc, 1);
+    // Bind V tex.
+    glActiveTexture(GL_TEXTURE0 + 2);
+    glBindTexture(GL_TEXTURE_2D, n->texture(2)->texID);
+    int vTexLoc = glGetUniformLocationARB(program, "v_texture");
+    glUniform1iARB(vTexLoc, 2);
+    // Set YUV offset.
+    int yuvAdjLoc = glGetUniformLocationARB(program, "yuv_adj");
+    glUniform3fARB(yuvAdjLoc, -0.0625f, -0.5f, -0.5f);
+    // Set YUV matrix.
+    int ccMatLoc = glGetUniformLocationARB(program, "cc_matrix");
+    glUniformMatrix3fvARB(ccMatLoc, 1, false, yuv2RGB);
+  }
+  GLint alpha = glGetUniformLocationARB(program, "alpha");
+  glUniform1fARB(alpha, 0.9);
+}
+
+void ConfigAndActivateShaderForTiling(ContentLayerNode* n) {
+  int program = ActivateShader(VERTEX_SHADER_POS_TEX_TRANSFORM,
+                               FRAGMENT_SHADER_RGBA_TEX_ALPHA,
+                               n->transform());
+  GLint texTrans = glGetUniformLocationARB(program, "texTransform");
+  glUniform4fARB(texTrans, 0.0, 0.0, 1.0, 1.0);
+  GLint alpha = glGetUniformLocationARB(program, "alpha");
+  glUniform1fARB(alpha, 0.9);
+
+  g_current_tile_layer_width = n->width();
+  g_current_tile_layer_height = n->height();
+  g_current_tile_width = n->tile_width();
+  g_current_tile_height = n->tile_height();
+}
+
+void DeleteShaders() {
+  g_active_index = -1;
+  glUseProgramObjectARB(0);
+  for (int i = 0; i < SHADER_ID_MAX*SHADER_ID_MAX; ++i) {
+    if (g_program_objects[i]) {
+      glDeleteObjectARB(g_program_objects[i]);
+    }
+    g_program_objects[i] = 0;
+  }
+}
+
+void InitBuffers() {
+  // Vertex positions and texture coordinates for the 4 corners of a 1x1 quad.
+  float vertices[] = { -0.5f,  0.5f, 0.0f, 0.0f,  1.0f,
+                       -0.5f, -0.5f, 0.0f, 0.0f,  0.0f,
+                       0.5f,  -0.5f, 0.0f, 1.0f,  0.0f,
+                       0.5f,   0.5f, 0.0f, 1.0f,  1.0f };
+  uint16_t indices[] = { 0, 1, 2, 0, 2, 3};
+
+  glGenBuffers(1, &g_quad_vertices_vbo);
+  glGenBuffers(1, &g_quad_elements_vbo);
+  glBindBuffer(GL_ARRAY_BUFFER, g_quad_vertices_vbo);
+  glBufferData(GL_ARRAY_BUFFER,
+               sizeof(vertices),
+               vertices,
+               GL_STATIC_DRAW);
+  glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_quad_elements_vbo);
+  glBufferData(GL_ELEMENT_ARRAY_BUFFER,
+               sizeof(indices),
+               indices,
+               GL_STATIC_DRAW);
+}
+
+void BeginFrame() {
+  glBindBuffer(GL_ARRAY_BUFFER, g_quad_vertices_vbo);
+  glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, g_quad_elements_vbo);
+  unsigned offset = 0;
+  glVertexAttribPointer(kPositionLocation,
+                        3,
+                        GL_FLOAT,
+                        false,
+                        5 * sizeof(float),
+                        reinterpret_cast<void*>(offset));
+  offset += 3 * sizeof(float);
+  glVertexAttribPointer(kTexCoordLocation,
+                        2,
+                        GL_FLOAT,
+                        false,
+                        5 * sizeof(float),
+                        reinterpret_cast<void*>(offset));
+  glEnableVertexAttribArray(kPositionLocation);
+  glEnableVertexAttribArray(kTexCoordLocation);
+}
+
+void DrawQuad(float width, float height) {
+  float mv_transform[16];
+  float proj_transform[16];
+  Scale(g_current_layer_transform, mv_transform, width, height, 1.0);
+  Project(mv_transform, proj_transform);
+  GLint mat = glGetUniformLocationARB(g_program_objects[g_active_index],
+                                      "matrix");
+  glUniformMatrix4fvARB(mat, 1, GL_TRUE, proj_transform);
+
+  glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, 0);
+}
+
+void DrawTileQuad(GLuint texID, int x, int y) {
+  float left = g_current_tile_width*x;
+  float top = g_current_tile_height*y;
+  if (left > g_current_tile_layer_width || top > g_current_tile_layer_height)
+    return;
+
+  float right = min(left+g_current_tile_width, g_current_tile_layer_width);
+  float bottom = min(top+g_current_tile_height, g_current_tile_layer_height);
+  float width = right-left;
+  float height = bottom-top;
+
+  int prog = g_program_objects[g_active_index];
+
+  // Scale the texture if the full tile rectangle doesn't get drawn.
+  float u_scale = width / g_current_tile_width;
+  float v_scale = height / g_current_tile_height;
+  GLint texTrans = glGetUniformLocationARB(prog, "texTransform");
+  glUniform4fARB(texTrans, 0.0, 0.0, u_scale, v_scale);
+
+  glActiveTexture(GL_TEXTURE0);
+  glBindTexture(GL_TEXTURE_2D, texID);
+  int texLoc = glGetUniformLocationARB(prog, "s_texture");
+  glUniform1iARB(texLoc, 0);
+
+  float mv_transform[16];
+  float proj_transform[16];
+  Scale(g_current_layer_transform, mv_transform, width, height, 1.0);
+
+  // We have to position the tile by its center.
+  float center_x = (left+right)/2 - g_current_tile_layer_width/2;
+  float center_y = (top+bottom)/2 - g_current_tile_layer_height/2;
+  TranslateInPlace(mv_transform, center_x, center_y, 0.0);
+
+  Project(mv_transform, proj_transform);
+  GLint mat = glGetUniformLocationARB(prog, "matrix");
+  glUniformMatrix4fvARB(mat, 1, GL_TRUE, proj_transform);
+
+  glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_SHORT, 0);
+}
+
diff --git a/gpu/tools/compositor_model_bench/shaders.h b/gpu/tools/compositor_model_bench/shaders.h
new file mode 100644
index 0000000..184fb80
--- /dev/null
+++ b/gpu/tools/compositor_model_bench/shaders.h
@@ -0,0 +1,54 @@
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Shaders from Chromium and an interface for setting them up
+
+#ifndef GPU_TOOLS_COMPOSITOR_MODEL_BENCH_SHADERS_H_
+#define GPU_TOOLS_COMPOSITOR_MODEL_BENCH_SHADERS_H_
+
+#include <string>
+
+// Forward declarations.
+struct CCNode;
+struct ContentLayerNode;
+class TextureBuilder;
+
+typedef unsigned int GLuint;
+
+enum ShaderID {
+  SHADER_UNRECOGNIZED = 0,
+  VERTEX_SHADER_POS_TEX_YUV_STRETCH,
+  VERTEX_SHADER_POS_TEX,
+  VERTEX_SHADER_POS_TEX_TRANSFORM,
+  FRAGMENT_SHADER_YUV_VIDEO,
+  FRAGMENT_SHADER_RGBA_TEX_FLIP_ALPHA,
+  FRAGMENT_SHADER_RGBA_TEX_ALPHA,
+  SHADER_ID_MAX
+};
+
+ShaderID ShaderIDFromString(std::string name);
+std::string ShaderNameFromID(ShaderID id);
+
+void ConfigAndActivateShaderForNode(CCNode* n);
+
+// Call once to set up the parameters for an entire tiled layer, then use
+// DrawTileQuad for each tile to be drawn.
+void ConfigAndActivateShaderForTiling(ContentLayerNode* n);
+
+// One-off function to set up global VBO's that will be used every time
+// we want to draw a quad.
+void InitBuffers();
+
+// Per-frame initialization of the VBO's (to replicate behavior in Chrome.)
+void BeginFrame();
+
+// Draw the quad in those VBO's.
+void DrawQuad(float width, float height);
+
+// Draw the quad in those VBO's for an individual tile within a tiled layer.
+// x and y give the 2D index of the tile.
+void DrawTileQuad(GLuint texID, int x, int y);
+
+#endif  // GPU_TOOLS_COMPOSITOR_MODEL_BENCH_SHADERS_H_
+
diff --git a/gpu/tools/tools.gyp b/gpu/tools/tools.gyp
new file mode 100644
index 0000000..0f1a9d2
--- /dev/null
+++ b/gpu/tools/tools.gyp
@@ -0,0 +1,37 @@
+# Copyright (c) 2011 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+{
+  'variables': {
+    'chromium_code': 1,
+  },
+  'targets': [
+  ],
+  'conditions': [
+    ['OS == "linux" and target_arch != "arm"', {
+      'targets': [
+        {
+          'target_name': 'compositor_model_bench',
+          'type': 'executable',
+          'dependencies': [
+            '../../base/base.gyp:base',
+            '../../ui/gfx/gl/gl.gyp:gl',
+          ],
+          'libraries': [
+            '-lGL',
+            '-ldl',
+          ],
+          'sources': [
+            'compositor_model_bench/compositor_model_bench.cc',
+            'compositor_model_bench/render_tree.cc',
+            'compositor_model_bench/shaders.cc',
+            'compositor_model_bench/render_models.cc',
+            'compositor_model_bench/render_model_utils.cc',
+            'compositor_model_bench/forward_render_model.cc',
+          ],
+        },
+      ],
+    }],
+  ],
+}