Moved code not relating to GPU scheduling out of GpuScheduler and into GpuCommandBufferStub.

This was mostly a refactor because the code was awkward.

I also deleted the original gles2_demo since we have the gles2 book demos now.

THings still to do are a common way of setting up the few objects involved in initializing a command buffer that is now more-or-less duplicated in the gles2 conformance tests, the gles2 demos, the command buffer stub and the in-process webgl context. I also want to completely remove the reference to the decoder from the scheduler.

I tested WebGL on both windows and mac and saw no regressions. I checked the conformance tests, the gpu tests and am running by the try bots now. The gles2 demos still work.
Review URL: http://codereview.chromium.org/7782041

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@101545 0039d316-1c4b-4281-b951-d872f2087c98

16 files changed, 46 insertions, 1259 deletions

diff --git a/gpu/command_buffer/client/cmd_buffer_helper_test.cc b/gpu/command_buffer/client/cmd_buffer_helper_test.cc
index 01f3760..c32a803 100644
--- a/gpu/command_buffer/client/cmd_buffer_helper_test.cc
+++ b/gpu/command_buffer/client/cmd_buffer_helper_test.cc
@@ -77,7 +77,7 @@ class CommandBufferHelperTest : public testing::Test {
         .WillRepeatedly(
             Invoke(do_jump_command_.get(), &DoJumpCommand::DoCommand));
 
-    gpu_scheduler_.reset(GpuScheduler::CreateForTests(
+    gpu_scheduler_.reset(new GpuScheduler(
         command_buffer_.get(), NULL, parser_));
     command_buffer_->SetPutOffsetChangeCallback(NewCallback(
         gpu_scheduler_.get(), &GpuScheduler::PutChanged));
diff --git a/gpu/command_buffer/client/fenced_allocator_test.cc b/gpu/command_buffer/client/fenced_allocator_test.cc
index 883d752..8f2f609 100644
--- a/gpu/command_buffer/client/fenced_allocator_test.cc
+++ b/gpu/command_buffer/client/fenced_allocator_test.cc
@@ -51,7 +51,7 @@ class BaseFencedAllocatorTest : public testing::Test {
                                 0,
                                 api_mock_.get());
 
-    gpu_scheduler_.reset(GpuScheduler::CreateForTests(
+    gpu_scheduler_.reset(new GpuScheduler(
         command_buffer_.get(), NULL, parser_));
     command_buffer_->SetPutOffsetChangeCallback(NewCallback(
         gpu_scheduler_.get(), &GpuScheduler::PutChanged));
diff --git a/gpu/command_buffer/client/gles2_demo.cc b/gpu/command_buffer/client/gles2_demo.cc
deleted file mode 100644
index 72937d5..0000000
--- a/gpu/command_buffer/client/gles2_demo.cc
+++ /dev/null
@@ -1,241 +0,0 @@
-// 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 file implements a standalone executable demo of using GLES2 over
-// command buffers. This code is temporary as the setup that happens
-// here is in a state of flux. Eventually there will be several versions of
-// setup, one for trusted code, one for pepper, one for NaCl, and maybe others.
-
-#include <windows.h>
-#include <windowsx.h>
-#include <shellapi.h>
-#include <stdlib.h>
-#include <stdio.h>
-#include "base/at_exit.h"
-#include "base/command_line.h"
-#include "base/callback.h"
-#include "base/memory/ref_counted.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/message_loop.h"
-#include "base/shared_memory.h"
-#include "gpu/command_buffer/service/context_group.h"
-#include "gpu/command_buffer/service/gpu_scheduler.h"
-#include "gpu/command_buffer/service/command_buffer_service.h"
-#include "gpu/command_buffer/client/gles2_implementation.h"
-#include "gpu/command_buffer/client/gles2_lib.h"
-#include "gpu/command_buffer/client/gles2_demo_c.h"
-#include "gpu/command_buffer/client/gles2_demo_cc.h"
-#include "ui/gfx/gl/gl_implementation.h"
-#include "ui/gfx/gl/gl_surface.h"
-
-using base::SharedMemory;
-using gpu::Buffer;
-using gpu::GpuScheduler;
-using gpu::CommandBufferService;
-using gpu::gles2::GLES2CmdHelper;
-using gpu::gles2::GLES2Implementation;
-
-#if defined(OS_WIN)
-HINSTANCE g_instance;
-#endif
-
-class GLES2Demo {
- public:
-  GLES2Demo();
-
-  bool GLES2Demo::Setup(void* hwnd, int32 size);
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(GLES2Demo);
-};
-
-GLES2Demo::GLES2Demo() {
-}
-
-bool GLES2Demo::Setup(void* hwnd, int32 size) {
-#if defined(OS_WIN)
-  InitializeGLBindings(gfx::kGLImplementationEGLGLES2);
-#else
-  InitializeGLBindings(gfx::kGLImplementationDesktopGL);
-#endif
-
-  scoped_ptr<CommandBufferService> command_buffer(new CommandBufferService);
-  if (!command_buffer->Initialize(size))
-    return NULL;
-
-  gpu::gles2::ContextGroup::Ref group(new gpu::gles2::ContextGroup(true));
-  GpuScheduler* gpu_scheduler = GpuScheduler::Create(command_buffer.get(),
-                                                     group.get());
-  if (!gpu_scheduler->Initialize(reinterpret_cast<HWND>(hwnd),
-                                 gfx::Size(),
-                                 false,
-                                 gpu::gles2::DisallowedExtensions(),
-                                 NULL,
-                                 std::vector<int32>(),
-                                 NULL)) {
-    return NULL;
-  }
-
-  command_buffer->SetPutOffsetChangeCallback(
-      NewCallback(gpu_scheduler, &GpuScheduler::PutChanged));
-
-  GLES2CmdHelper* helper = new GLES2CmdHelper(command_buffer.get());
-  if (!helper->Initialize(size)) {
-    // TODO(gman): cleanup.
-    return false;
-  }
-
-  size_t transfer_buffer_size = 512 * 1024;
-  int32 transfer_buffer_id =
-      command_buffer->CreateTransferBuffer(transfer_buffer_size, -1);
-  Buffer transfer_buffer =
-      command_buffer->GetTransferBuffer(transfer_buffer_id);
-  if (!transfer_buffer.ptr)
-    return false;
-
-
-  gles2::Initialize();
-  gles2::SetGLContext(new GLES2Implementation(helper,
-                                              transfer_buffer.size,
-                                              transfer_buffer.ptr,
-                                              transfer_buffer_id,
-                                              false,
-                                              true));
-
-  GLFromCPPInit();
-
-  return command_buffer.release() != NULL;
-}
-
-#if defined(OS_WIN)
-LRESULT CALLBACK WindowProc(
-    HWND hwnd, UINT msg, WPARAM w_param, LPARAM l_param) {
-  switch (msg) {
-    case WM_CLOSE:
-      DestroyWindow(hwnd);
-      break;
-    case WM_DESTROY:
-      PostQuitMessage(0);
-      break;
-    case WM_PAINT: {
-      GLFromCPPDraw();
-      GLFromCDraw();
-      // TODO(gman): Not sure how SwapBuffer should be exposed.
-      gles2::GetGLContext()->SwapBuffers();
-      break;
-    }
-    default:
-      return ::DefWindowProc(hwnd, msg, w_param, l_param);
-  }
-  return 0;
-}
-
-void ProcessMessages(void* in_hwnd) {
-  HWND hwnd = reinterpret_cast<HWND>(in_hwnd);
-  MSG msg;
-
-  bool done = false;
-  while (!done) {
-    while (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) {
-      if (msg.message == WM_QUIT) {
-        done = true;
-      }
-      // dispatch the message
-      TranslateMessage(&msg);
-      DispatchMessage(&msg);
-    }
-    if (!done) {
-      InvalidateRect(hwnd, NULL, TRUE);
-    }
-  }
-}
-
-#endif
-
-void* SetupWindow() {
-#if defined(OS_WIN)
-  WNDCLASSEX wc = {0};
-  wc.lpszClassName = L"MY_WINDOWS_CLASS";
-  wc.cbSize = sizeof(WNDCLASSEX);
-  wc.style = CS_HREDRAW | CS_VREDRAW;
-  wc.lpfnWndProc = ::WindowProc;
-  wc.cbClsExtra = 0;
-  wc.cbWndExtra = 0;
-  wc.hInstance = g_instance;
-  wc.hIcon = ::LoadIcon(g_instance, IDI_APPLICATION);
-  wc.hIconSm = NULL;
-  wc.hCursor = ::LoadCursor(g_instance, IDC_ARROW);
-  wc.hbrBackground = static_cast<HBRUSH>(::GetStockObject(BLACK_BRUSH));
-  wc.lpszMenuName = NULL;
-
-  if (!::RegisterClassEx(&wc))
-    return false;
-
-  // Leaving this window onscreen leads to a redraw error which makes it
-  // a hassle to debug tests in an IDE, so we place the window somewhere that
-  // won't happen.
-  HWND hwnd = ::CreateWindowExW(
-      NULL,
-      wc.lpszClassName,
-      L"",
-      WS_OVERLAPPEDWINDOW,
-      10,
-      0,
-      512,
-      512,
-      0,
-      0,
-      g_instance,
-      0);
-
-  if (hwnd == NULL) {
-    return false;
-  }
-
-  ::ShowWindow(hwnd, SW_SHOWNORMAL);
-
-
-  return hwnd;
-#else
-#error Need code.
-#endif
-}
-
-#if defined(OS_WIN)
-int WINAPI WinMain(HINSTANCE instance,
-                   HINSTANCE prev_instance,
-                   LPSTR command_line,
-                   int command_show) {
-  g_instance = instance;
-  int argc = 1;
-  const char* const argv[] = {
-    "gles2_demo.exe"
-  };
-
-#else
-int main(int argc, char** argv) {
-#endif
-  CommandLine::Init(argc, argv);
-
-  const int32 kCommandBufferSize = 1024 * 1024;
-
-  base::AtExitManager at_exit_manager;
-  MessageLoopForUI message_loop;
-
-  gfx::GLSurface::InitializeOneOff();
-
-  GLES2Demo* demo = new GLES2Demo();
-
-  void* hwnd = SetupWindow();
-  if (!hwnd) {
-    ::fprintf(stdout, "Could not setup window.\n");
-    return EXIT_FAILURE;
-  }
-
-  demo->Setup(hwnd, kCommandBufferSize);
-
-  ProcessMessages(hwnd);
-
-  return EXIT_SUCCESS;
-}
diff --git a/gpu/command_buffer/client/gles2_demo_c.c b/gpu/command_buffer/client/gles2_demo_c.c
deleted file mode 100644
index e369745..0000000
--- a/gpu/command_buffer/client/gles2_demo_c.c
+++ /dev/null
@@ -1,15 +0,0 @@
-// Copyright (c) 2009 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 file is here so other GLES2 related files can have a common set of
-// includes where appropriate.
-
-#include <GLES2/gl2.h>
-#include "command_buffer/client/gles2_demo_c.h"
-
-void GLFromCDraw() {
-  // glClear(GL_COLOR_BUFFER_BIT);
-}
-
-
diff --git a/gpu/command_buffer/client/gles2_demo_c.h b/gpu/command_buffer/client/gles2_demo_c.h
deleted file mode 100644
index d4d69e9..0000000
--- a/gpu/command_buffer/client/gles2_demo_c.h
+++ /dev/null
@@ -1,22 +0,0 @@
-// Copyright (c) 2009 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 Test that we can access GL from c.
-
-#ifndef GPU_COMMAND_BUFFER_CLIENT_GLES2_DEMO_C_H
-#define GPU_COMMAND_BUFFER_CLIENT_GLES2_DEMO_C_H
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-void GLFromCDraw();
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif  // GPU_COMMAND_BUFFER_CLIENT_GLES2_DEMO_C_H
-
-
diff --git a/gpu/command_buffer/client/gles2_demo_cc.cc b/gpu/command_buffer/client/gles2_demo_cc.cc
deleted file mode 100644
index 80837ea..0000000
--- a/gpu/command_buffer/client/gles2_demo_cc.cc
+++ /dev/null
@@ -1,408 +0,0 @@
-// 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 file is here so other GLES2 related files can have a common set of
-// includes where appropriate.
-
-#include "../client/gles2_demo_cc.h"
-#include "../common/logging.h"
-
-#include <math.h>
-#include <string>
-
-// This is here so we have at least some idea that the inline path is working.
-#define GLES2_INLINE_OPTIMIZATION
-#include <GLES2/gl2.h>
-#include <GLES2/gl2ext.h>
-#include "../common/logging.h"
-
-namespace {
-
-int g_frameCount = 0;
-int g_textureIndex = 0;
-int g_numTextures = 1;
-GLuint g_textures[5];
-int g_textureLoc = -1;
-GLuint g_programObject = 0;
-GLuint g_worldMatrixLoc = 0;
-GLuint g_vbo = 0;
-GLsizei g_texCoordOffset = 0;
-int g_angle = 0;
-
-void CheckGLError(const char* func_name, int line_no) {
-#ifndef NDEBUG
-  GLenum error = GL_NO_ERROR;
-  while ((error = glGetError()) != GL_NO_ERROR) {
-    GPU_DLOG(gpu::ERROR) << "GL Error in " << func_name << " at line "
-        << line_no << ": " << error;
-  }
-#endif
-}
-
-GLuint LoadShader(GLenum type, const char* shaderSrc) {
-  CheckGLError("LoadShader", __LINE__);
-  GLuint shader = glCreateShader(type);
-  if (shader == 0) {
-    return 0;
-  }
-  // Load the shader source
-  glShaderSource(shader, 1, &shaderSrc, NULL);
-  // Compile the shader
-  glCompileShader(shader);
-  // Check the compile status
-  GLint value = 0;
-  glGetShaderiv(shader, GL_COMPILE_STATUS, &value);
-  if (value == 0) {
-    char buffer[1024];
-    GLsizei length = 0;
-    glGetShaderInfoLog(shader, sizeof(buffer), &length, buffer);
-    std::string log(buffer, length);
-    GPU_DLOG(gpu::ERROR) << "Error compiling shader:" << log;
-    glDeleteShader(shader);
-    return 0;
-  }
-  return shader;
-}
-
-void InitShaders() {
-  static const char* vShaderStr =
-    "uniform mat4 worldMatrix;\n"
-    "attribute vec3 g_Position;\n"
-    "attribute vec2 g_TexCoord0;\n"
-    "varying vec2 texCoord;\n"
-    "void main()\n"
-    "{\n"
-    "   gl_Position = worldMatrix *\n"
-    "                 vec4(g_Position.x, g_Position.y, g_Position.z, 1.0);\n"
-    "   texCoord = g_TexCoord0;\n"
-    "}\n";
-  static const char* fShaderStr =
-    "precision mediump float;"
-    "uniform sampler2D tex;\n"
-    "varying vec2 texCoord;\n"
-    "void main()\n"
-    "{\n"
-    "  gl_FragColor = texture2D(tex, texCoord);\n"
-    "}\n";
-
-  CheckGLError("InitShaders", __LINE__);
-  GLuint vertexShader = LoadShader(GL_VERTEX_SHADER, vShaderStr);
-  GLuint fragmentShader = LoadShader(GL_FRAGMENT_SHADER, fShaderStr);
-  // Create the program object
-  GLuint programObject = glCreateProgram();
-  if (programObject == 0) {
-    GPU_DLOG(gpu::ERROR) << "Creating program failed";
-    return;
-  }
-  glAttachShader(programObject, vertexShader);
-  glAttachShader(programObject, fragmentShader);
-  // Bind g_Position to attribute 0
-  // Bind g_TexCoord0 to attribute 1
-  glBindAttribLocation(programObject, 0, "g_Position");
-  glBindAttribLocation(programObject, 1, "g_TexCoord0");
-  // Link the program
-  glLinkProgram(programObject);
-  // Check the link status
-  GLint linked = 0;
-  glGetProgramiv(programObject, GL_LINK_STATUS, &linked);
-  if (linked == 0) {
-    char buffer[1024];
-    GLsizei length = 0;
-    glGetProgramInfoLog(programObject, sizeof(buffer), &length, buffer);
-    std::string log(buffer, length);
-    GPU_DLOG(gpu::ERROR) << "Error linking program:" << log;
-    glDeleteProgram(programObject);
-    return;
-  }
-  g_programObject = programObject;
-  g_worldMatrixLoc = glGetUniformLocation(g_programObject, "worldMatrix");
-  g_textureLoc = glGetUniformLocation(g_programObject, "tex");
-  glGenBuffers(1, &g_vbo);
-  glBindBuffer(GL_ARRAY_BUFFER, g_vbo);
-  static float vertices[] = {
-      0.25,  0.75, 0.0,
-     -0.75,  0.75, 0.0,
-     -0.75, -0.25, 0.0,
-      0.25,  0.75, 0.0,
-     -0.75, -0.25, 0.0,
-      0.25, -0.25, 0.0,
-  };
-  static float texCoords[] = {
-    1.0, 1.0,
-    0.0, 1.0,
-    0.0, 0.0,
-    1.0, 1.0,
-    0.0, 0.0,
-    1.0, 0.0,
-  };
-  g_texCoordOffset = sizeof(vertices);
-  glBufferData(GL_ARRAY_BUFFER,
-               sizeof(vertices) + sizeof(texCoords),
-               NULL,
-               GL_STATIC_DRAW);
-  glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(vertices), vertices);
-  glBufferSubData(GL_ARRAY_BUFFER, g_texCoordOffset,
-                  sizeof(texCoords), texCoords);
-  CheckGLError("InitShaders", __LINE__);
-}
-
-GLuint CreateCheckerboardTexture() {
-  CheckGLError("CreateCheckerboardTexture", __LINE__);
-  static unsigned char pixels[] = {
-    255, 255, 255,
-    0,   0,   0,
-    0,   0,   0,
-    255, 255, 255,
-  };
-  GLuint texture;
-  glGenTextures(1, &texture);
-  glBindTexture(GL_TEXTURE_2D, texture);
-  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
-  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
-  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
-  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
-  glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
-  glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 2, 2, 0, GL_RGB, GL_UNSIGNED_BYTE,
-               pixels);
-  CheckGLError("CreateCheckerboardTexture", __LINE__);
-  return texture;
-}
-
-GLuint CreateCompressedTexture(
-    const void* data,
-    GLsizeiptr size,
-    GLenum format,
-    GLint width,
-    GLint height) {
-  GLuint texture;
-  glGenTextures(1, &texture);
-  glBindTexture(GL_TEXTURE_2D, texture);
-  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
-  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
-  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
-  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
-  glCompressedTexImage2D(
-      GL_TEXTURE_2D, 0, format, width, height, 0, size, data);
-  CheckGLError("CreateCompressedTxture", __LINE__);
-  return texture;
-}
-
-GLuint LoadDXT1RGBTexture() {
-  static unsigned char data[] = {
-    0x00, 0xd0, 0x00, 0xef, 0x00, 0xaa, 0x95, 0xd5,
-    0x00, 0x90, 0x57, 0xff, 0x00, 0xaa, 0xff, 0x55,
-    0x00, 0x88, 0x99, 0xff, 0x00, 0xaa, 0xff, 0x55,
-    0x20, 0xb8, 0xe4, 0xf6, 0x00, 0xaa, 0x5b, 0x5d,
-    0x21, 0x09, 0xe6, 0x27, 0x15, 0x15, 0x15, 0x15,
-    0xd7, 0xbd, 0xff, 0xff, 0x56, 0x16, 0x16, 0x56,
-    0x00, 0x00, 0xff, 0xff, 0x55, 0x00, 0x00, 0x55,
-    0xe0, 0x08, 0xa9, 0x2f, 0x51, 0x58, 0x56, 0x54,
-    0xff, 0x07, 0x15, 0x09, 0x40, 0x6a, 0xd5, 0xd5,
-    0xd7, 0xbd, 0xff, 0xff, 0x56, 0x16, 0x16, 0x16,
-    0x91, 0x08, 0xff, 0xff, 0x55, 0xff, 0x00, 0x03,
-    0xfe, 0x07, 0x5b, 0x09, 0x01, 0xa9, 0x55, 0xff,
-    0x0d, 0x10, 0x18, 0xe8, 0xea, 0x15, 0x95, 0x55,
-    0x08, 0x88, 0x3c, 0xe7, 0x55, 0x55, 0xff, 0x00,
-    0x10, 0x20, 0x18, 0xe8, 0xa8, 0x54, 0x56, 0x55,
-    0x1f, 0x78, 0x15, 0xf8, 0x00, 0xaa, 0x55, 0x55,
-  };
-  return CreateCompressedTexture(
-      data, sizeof(data), GL_COMPRESSED_RGB_S3TC_DXT1_EXT, 16, 16);
-}
-
-GLuint LoadDXT1RGBATexture() {
-  static unsigned char data[] = {
-    0xff, 0xff, 0x90, 0xee, 0x00, 0xaa, 0xff, 0x55,
-    0x53, 0xde, 0xdd, 0xff, 0x55, 0x55, 0x00, 0xff,
-    0xc9, 0xb4, 0xdd, 0xff, 0x55, 0x55, 0xaa, 0xff,
-    0x6f, 0xee, 0xdd, 0xff, 0x55, 0x55, 0xa8, 0x03,
-    0x60, 0xa3, 0xa5, 0xe5, 0x55, 0x55, 0xaa, 0x00,
-    0x00, 0x00, 0x01, 0x00, 0xff, 0xff, 0xff, 0xff,
-    0x80, 0xab, 0xc2, 0xc4, 0xff, 0x55, 0xaa, 0xff,
-    0x60, 0x9b, 0xa5, 0xe5, 0x57, 0x56, 0xaa, 0x00,
-    0x1f, 0xbf, 0xff, 0xf7, 0x55, 0x55, 0xaa, 0x00,
-    0x00, 0x00, 0x01, 0x00, 0xff, 0xff, 0xff, 0xff,
-    0xfe, 0xbe, 0x7e, 0xdf, 0xff, 0xaa, 0x55, 0x00,
-    0xfe, 0xbe, 0xff, 0xf7, 0x54, 0x56, 0xaa, 0x00,
-    0xfa, 0x4c, 0x7e, 0x9e, 0x55, 0xaa, 0x00, 0x00,
-    0xbb, 0x2c, 0x98, 0x54, 0xff, 0xff, 0x55, 0xaa,
-    0xfa, 0x4c, 0x7e, 0x9e, 0x55, 0xaa, 0x00, 0x00,
-    0xfa, 0x4c, 0x7e, 0x9e, 0x55, 0xaa, 0x00, 0x00,
-  };
-  return CreateCompressedTexture(
-      data, sizeof(data), GL_COMPRESSED_RGBA_S3TC_DXT1_EXT, 16, 16);
-}
-
-GLuint LoadDXT3RGBATexture() {
-  static unsigned char data[] = {
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    0xa3, 0x22, 0x03, 0x03, 0x55, 0xff, 0xaa, 0x00,
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00,
-    0xcf, 0x7c, 0xc3, 0x12, 0x55, 0x55, 0x55, 0x54,
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00,
-    0x83, 0x1a, 0x03, 0x03, 0x55, 0xff, 0x00, 0x00,
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xf0, 0xff,
-    0xcf, 0x7c, 0xc3, 0x12, 0x55, 0x55, 0x55, 0x54,
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    0xc3, 0x59, 0x63, 0x32, 0x55, 0xff, 0xaa, 0x00,
-    0x00, 0x00, 0x00, 0x40, 0x00, 0x40, 0x00, 0x00,
-    0x8f, 0x94, 0x03, 0x4a, 0x54, 0x94, 0x94, 0x54,
-    0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0x00, 0x00,
-    0xa3, 0x59, 0x43, 0x2a, 0x55, 0xff, 0xaa, 0x00,
-    0xf0, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe, 0xff,
-    0xaf, 0x84, 0x03, 0x42, 0x54, 0x55, 0x55, 0x55,
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    0xc3, 0xa0, 0x83, 0x71, 0x55, 0xff, 0xaa, 0x00,
-    0x00, 0x00, 0x00, 0x40, 0x00, 0x40, 0x00, 0x40,
-    0x0f, 0xb4, 0x43, 0x81, 0x54, 0x94, 0x94, 0x94,
-    0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    0xc3, 0xa0, 0x83, 0x69, 0x55, 0xff, 0xaa, 0x00,
-    0xfe, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    0xc3, 0xa0, 0x83, 0x69, 0x55, 0xfd, 0xaa, 0x00,
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    0x23, 0xd0, 0xa3, 0xb0, 0x55, 0xff, 0xaa, 0x00,
-    0x00, 0x40, 0x00, 0x40, 0xff, 0xff, 0xff, 0xff,
-    0xf0, 0xc3, 0x43, 0xc0, 0x94, 0x94, 0x55, 0x55,
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    0x23, 0xd0, 0xa3, 0xb0, 0x55, 0xff, 0xaa, 0x00,
-    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
-    0x23, 0xd0, 0xa3, 0xb0, 0x55, 0xff, 0xaa, 0x00,
-  };
-  return CreateCompressedTexture(
-      data, sizeof(data), GL_COMPRESSED_RGBA_S3TC_DXT3_EXT, 16, 16);
-}
-
-GLuint LoadDXT5RGBATexture() {
-  static unsigned char data[] = {
-    0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-    0x72, 0xdd, 0x03, 0x92, 0x2d, 0x2d, 0x2d, 0x2d,
-    0x04, 0xfb, 0xff, 0xff, 0xff, 0x49, 0x02, 0xdb,
-    0x97, 0xf6, 0x32, 0xcd, 0xc0, 0xc0, 0x7b, 0xc0,
-    0xfb, 0xff, 0x49, 0x92, 0x24, 0x00, 0x60, 0xdb,
-    0x11, 0xcd, 0x67, 0x82, 0x78, 0x78, 0x5e, 0x78,
-    0x04, 0xfb, 0xff, 0xff, 0xff, 0xf9, 0x8f, 0xff,
-    0x2e, 0xac, 0xc4, 0x71, 0x15, 0x15, 0x15, 0x14,
-    0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-    0x72, 0xdd, 0x03, 0x92, 0x2d, 0x2d, 0x2d, 0x2d,
-    0x04, 0x43, 0xb0, 0x0d, 0x3b, 0xb0, 0x03, 0xdb,
-    0xb8, 0xf6, 0xd5, 0xd5, 0x60, 0x60, 0x60, 0x60,
-    0xfb, 0x00, 0x49, 0x02, 0x00, 0x00, 0x90, 0x24,
-    0xb0, 0xbc, 0x26, 0x7a, 0x78, 0x78, 0x78, 0x78,
-    0x04, 0xf7, 0xf8, 0x9f, 0xff, 0xf9, 0x9f, 0xff,
-    0x0e, 0xac, 0x83, 0x69, 0x34, 0x35, 0x35, 0x35,
-    0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-    0x72, 0xdd, 0x03, 0x92, 0x2d, 0x2d, 0x2d, 0x2d,
-    0x04, 0x43, 0xb0, 0x0d, 0x3b, 0xb0, 0x03, 0x3b,
-    0xb8, 0xf6, 0xd5, 0xd5, 0x60, 0x60, 0x60, 0x60,
-    0xfb, 0xff, 0xb6, 0x0d, 0x00, 0x49, 0x92, 0x24,
-    0x11, 0xcd, 0x67, 0x82, 0x78, 0x5e, 0x78, 0x78,
-    0xea, 0xff, 0x4a, 0xd2, 0x24, 0x49, 0x92, 0x24,
-    0x0e, 0xac, 0xc4, 0x71, 0x15, 0x15, 0x15, 0x15,
-    0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-    0x72, 0xdd, 0x03, 0x92, 0x2d, 0x2d, 0x2d, 0x2d,
-    0xfd, 0x00, 0x49, 0x9c, 0xc4, 0x00, 0x00, 0x00,
-    0xb8, 0xf6, 0x53, 0xcd, 0xe0, 0xe0, 0x7f, 0xe0,
-    0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-    0xf1, 0xcc, 0x46, 0x82, 0x78, 0x78, 0x78, 0x78,
-    0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-    0x0e, 0xac, 0xc4, 0x71, 0x15, 0x15, 0x15, 0x15,
-  };
-  return CreateCompressedTexture(
-      data, sizeof(data), GL_COMPRESSED_RGBA_S3TC_DXT5_EXT, 16, 16);
-}
-
-}  // anonymous namespace.
-
-void GLFromCPPInit() {
-  CheckGLError("GLFromCPPInit", __LINE__);
-  g_textures[0] = CreateCheckerboardTexture();
-  glClearColor(0.f, 0.f, .7f, 1.f);
-  const char* extensions =
-      reinterpret_cast<const char*>(glGetString(GL_EXTENSIONS));
-  if (strstr(extensions, "GL_EXT_texture_compression_dxt1")) {
-    g_textures[g_numTextures++] = LoadDXT1RGBTexture();
-    g_textures[g_numTextures++] = LoadDXT1RGBATexture();
-  }
-  if (strstr(extensions, "GL_CHROMIUM_texture_compression_dxt3")) {
-    g_textures[g_numTextures++] = LoadDXT3RGBATexture();
-  }
-  if (strstr(extensions, "GL_CHROMIUM_texture_compression_dxt5")) {
-    g_textures[g_numTextures++] = LoadDXT5RGBATexture();
-  }
-  InitShaders();
-  CheckGLError("GLFromCPPInit", __LINE__);
-
-  char buf[128];
-  glReadPixels(0, 0, 1, 1, 0, 0, buf);
-  CheckGLError("GLFromCPPInit:ReadPixels", __LINE__);
-}
-
-void GLFromCPPDraw() {
-  const float kPi = 3.1415926535897932384626433832795f;
-
-  CheckGLError("GLFromCPPDraw", __LINE__);
-  // TODO(kbr): base the angle on time rather than on ticks
-  g_angle = (g_angle + 1) % 360;
-  // Rotate about the Z axis
-  GLfloat rot_matrix[16];
-  GLfloat cos_angle = cosf(static_cast<GLfloat>(g_angle) * kPi / 180.0f);
-  GLfloat sin_angle = sinf(static_cast<GLfloat>(g_angle) * kPi / 180.0f);
-  // OpenGL matrices are column-major
-  rot_matrix[0] = cos_angle;
-  rot_matrix[1] = sin_angle;
-  rot_matrix[2] = 0.0f;
-  rot_matrix[3] = 0.0f;
-
-  rot_matrix[4] = -sin_angle;
-  rot_matrix[5] = cos_angle;
-  rot_matrix[6] = 0.0f;
-  rot_matrix[7] = 0.0f;
-
-  rot_matrix[8] = 0.0f;
-  rot_matrix[9] = 0.0f;
-  rot_matrix[10] = 1.0f;
-  rot_matrix[11] = 0.0f;
-
-  rot_matrix[12] = 0.0f;
-  rot_matrix[13] = 0.0f;
-  rot_matrix[14] = 0.0f;
-  rot_matrix[15] = 1.0f;
-
-  g_frameCount++;
-  if (g_frameCount > 60)
-  {
-    g_frameCount = 0;
-    g_textureIndex = (g_textureIndex + 1) % g_numTextures;
-  }
-
-  // Note: the viewport is automatically set up to cover the entire Canvas.
-  // Clear the color buffer
-  glClear(GL_COLOR_BUFFER_BIT);
-  glEnable(GL_BLEND);
-  glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
-  CheckGLError("GLFromCPPDraw", __LINE__);
-  // Use the program object
-  glUseProgram(g_programObject);
-  CheckGLError("GLFromCPPDraw", __LINE__);
-  // Set up the model matrix
-  glUniformMatrix4fv(g_worldMatrixLoc, 1, GL_FALSE, rot_matrix);
-
-  // Load the vertex data
-  glBindBuffer(GL_ARRAY_BUFFER, g_vbo);
-  glEnableVertexAttribArray(0);
-  glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, 0);
-  glEnableVertexAttribArray(1);
-  glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 0,
-                        reinterpret_cast<const void*>(g_texCoordOffset));
-  CheckGLError("GLFromCPPDraw", __LINE__);
-  // Bind the texture to texture unit 0
-  glBindTexture(GL_TEXTURE_2D, g_textures[g_textureIndex]);
-  CheckGLError("GLFromCPPDraw", __LINE__);
-  // Point the uniform sampler to texture unit 0
-  glUniform1i(g_textureLoc, 0);
-  CheckGLError("GLFromCPPDraw", __LINE__);
-  glDrawArrays(GL_TRIANGLES, 0, 6);
-  CheckGLError("GLFromCPPDraw", __LINE__);
-  glFlush();
-}
diff --git a/gpu/command_buffer/client/gles2_demo_cc.h b/gpu/command_buffer/client/gles2_demo_cc.h
deleted file mode 100644
index 158ba43..0000000
--- a/gpu/command_buffer/client/gles2_demo_cc.h
+++ /dev/null
@@ -1,15 +0,0 @@
-// Copyright (c) 2009 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 Test that we can access GL from C++.
-
-#ifndef GPU_COMMAND_BUFFER_CLIENT_GLES2_DEMO_CC_H
-#define GPU_COMMAND_BUFFER_CLIENT_GLES2_DEMO_CC_H
-
-void GLFromCPPInit();
-void GLFromCPPDraw();
-
-#endif  // GPU_COMMAND_BUFFER_CLIENT_GLES2_DEMO_CC_H
-
-
diff --git a/gpu/command_buffer/client/mapped_memory_unittest.cc b/gpu/command_buffer/client/mapped_memory_unittest.cc
index 735ac23..ee9b025 100644
--- a/gpu/command_buffer/client/mapped_memory_unittest.cc
+++ b/gpu/command_buffer/client/mapped_memory_unittest.cc
@@ -49,7 +49,7 @@ class MappedMemoryTestBase : public testing::Test {
                                 0,
                                 api_mock_.get());
 
-    gpu_scheduler_.reset(GpuScheduler::CreateForTests(
+    gpu_scheduler_.reset(new GpuScheduler(
         command_buffer_.get(), NULL, parser_));
     command_buffer_->SetPutOffsetChangeCallback(NewCallback(
         gpu_scheduler_.get(), &GpuScheduler::PutChanged));
diff --git a/gpu/command_buffer/client/ring_buffer_test.cc b/gpu/command_buffer/client/ring_buffer_test.cc
index a816393..ee21614 100644
--- a/gpu/command_buffer/client/ring_buffer_test.cc
+++ b/gpu/command_buffer/client/ring_buffer_test.cc
@@ -71,7 +71,7 @@ class BaseRingBufferTest : public testing::Test {
                                 0,
                                 api_mock_.get());
 
-    gpu_scheduler_.reset(GpuScheduler::CreateForTests(
+    gpu_scheduler_.reset(new GpuScheduler(
         command_buffer_.get(), NULL, parser_));
     command_buffer_->SetPutOffsetChangeCallback(NewCallback(
         gpu_scheduler_.get(), &GpuScheduler::PutChanged));
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder.cc b/gpu/command_buffer/service/gles2_cmd_decoder.cc
index eef54c3..530342b 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -2362,9 +2362,8 @@ void GLES2DecoderImpl::Destroy() {
 
   if (context_.get()) {
     context_->ReleaseCurrent(NULL);
-    context_->Destroy();
+    context_ = NULL;
   }
-  context_ = NULL;
 
   offscreen_target_frame_buffer_.reset();
   offscreen_target_color_texture_.reset();
diff --git a/gpu/command_buffer/service/gpu_scheduler.cc b/gpu/command_buffer/service/gpu_scheduler.cc
index 70f84a4..a6442e9 100644
--- a/gpu/command_buffer/service/gpu_scheduler.cc
+++ b/gpu/command_buffer/service/gpu_scheduler.cc
@@ -19,119 +19,32 @@ using ::base::SharedMemory;
 
 namespace gpu {
 
-GpuScheduler* GpuScheduler::Create(CommandBuffer* command_buffer,
-                                   gles2::ContextGroup* group) {
-  DCHECK(command_buffer);
-
-  gles2::GLES2Decoder* decoder = gles2::GLES2Decoder::Create(group);
-
-  GpuScheduler* scheduler = new GpuScheduler(command_buffer,
-                                             decoder,
-                                             NULL);
-
-  decoder->set_engine(scheduler);
-
-  if (CommandLine::ForCurrentProcess()->HasSwitch(
-      switches::kEnableGPUServiceLogging)) {
-    decoder->set_debug(true);
-  }
-
-  return scheduler;
-}
-
-GpuScheduler* GpuScheduler::CreateForTests(CommandBuffer* command_buffer,
-                                           gles2::GLES2Decoder* decoder,
-                                           CommandParser* parser) {
-  DCHECK(command_buffer);
-  GpuScheduler* scheduler = new GpuScheduler(command_buffer,
-                                             decoder,
-                                             parser);
-
-  return scheduler;
-}
-
-GpuScheduler::~GpuScheduler() {
-  Destroy();
-}
-
-bool GpuScheduler::InitializeCommon(
-    const scoped_refptr<gfx::GLSurface>& surface,
-    const scoped_refptr<gfx::GLContext>& context,
-    const gfx::Size& size,
-    const gles2::DisallowedExtensions& disallowed_extensions,
-    const char* allowed_extensions,
-    const std::vector<int32>& attribs) {
-  DCHECK(context);
-
-  if (!context->MakeCurrent(surface))
-    return false;
-
-#if !defined(OS_MACOSX) && !defined(TOUCH_UI)
-  // Set up swap interval for onscreen contexts.
-  if (!surface->IsOffscreen()) {
-    if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kDisableGpuVsync))
-      context->SetSwapInterval(0);
-    else
-      context->SetSwapInterval(1);
-  }
-#endif
-
+GpuScheduler::GpuScheduler(CommandBuffer* command_buffer,
+                           gles2::GLES2Decoder* decoder,
+                           CommandParser* parser)
+    : command_buffer_(command_buffer),
+      decoder_(decoder),
+      parser_(parser),
+      unscheduled_count_(0) {
   // Map the ring buffer and create the parser.
-  Buffer ring_buffer = command_buffer_->GetRingBuffer();
-  if (ring_buffer.ptr) {
-    parser_.reset(new CommandParser(ring_buffer.ptr,
-                                    ring_buffer.size,
-                                    0,
-                                    ring_buffer.size,
-                                    0,
-                                    decoder_.get()));
-  } else {
-    parser_.reset(new CommandParser(NULL, 0, 0, 0, 0,
-                                    decoder_.get()));
-  }
-
-  // Initialize the decoder with either the view or pbuffer GLContext.
-  // TODO(apatrick): The GpuScheduler should know nothing about the surface the
-  // decoder is rendering to. Get rid of the surface parameter.
-  if (!decoder_->Initialize(surface,
-                            context,
-                            size,
-                            disallowed_extensions,
-                            allowed_extensions,
-                            attribs)) {
-    LOG(ERROR) << "GpuScheduler::InitializeCommon failed because decoder "
-               << "failed to initialize.";
-    Destroy();
-    return false;
-  }
-
-  return true;
-}
-
-void GpuScheduler::DestroyCommon() {
-  if (decoder_.get()) {
-    decoder_->MakeCurrent();
-    decoder_->Destroy();
-    decoder_.reset();
+  if (!parser) {
+    Buffer ring_buffer = command_buffer_->GetRingBuffer();
+    if (ring_buffer.ptr) {
+      parser_.reset(new CommandParser(ring_buffer.ptr,
+                                      ring_buffer.size,
+                                      0,
+                                      ring_buffer.size,
+                                      0,
+                                      decoder_));
+    } else {
+      parser_.reset(new CommandParser(NULL, 0, 0, 0, 0,
+                                      decoder_));
+    }
   }
-
-  parser_.reset();
-}
-
-bool GpuScheduler::SetParent(GpuScheduler* parent_scheduler,
-                             uint32 parent_texture_id) {
-  if (parent_scheduler)
-    return decoder_->SetParent(parent_scheduler->decoder_.get(),
-                               parent_texture_id);
-  else
-    return decoder_->SetParent(NULL, 0);
 }
 
-#if defined(OS_MACOSX)
-namespace {
-const unsigned int kMaxOutstandingSwapBuffersCallsPerOnscreenContext = 1;
+GpuScheduler::~GpuScheduler() {
 }
-#endif
 
 void GpuScheduler::PutChanged() {
   TRACE_EVENT1("gpu", "GpuScheduler:PutChanged", "this", this);
@@ -143,23 +56,6 @@ void GpuScheduler::PutChanged() {
   if (state.error != error::kNoError)
     return;
 
-  if (decoder_.get()) {
-    if (!decoder_->MakeCurrent()) {
-      LOG(ERROR) << "Context lost because MakeCurrent failed.";
-      command_buffer_->SetContextLostReason(decoder_->GetContextLostReason());
-      command_buffer_->SetParseError(error::kLostContext);
-      return;
-    }
-  }
-
-#if defined(OS_MACOSX)
-  bool do_rate_limiting = surface_.get() != NULL;
-
-  // Don't swamp the browser process with SwapBuffers calls it can't handle.
-  DCHECK(!do_rate_limiting ||
-         swap_buffers_count_ - acknowledged_swap_buffers_count_ == 0);
-#endif
-
   error::Error error = error::kNoError;
   while (!parser_->IsEmpty()) {
     error = parser_->ProcessCommand();
@@ -226,28 +122,9 @@ int32 GpuScheduler::GetGetOffset() {
   return parser_->get();
 }
 
-void GpuScheduler::SetResizeCallback(
-    Callback1<gfx::Size>::Type* callback) {
-  decoder_->SetResizeCallback(callback);
-}
-
 void GpuScheduler::SetCommandProcessedCallback(
     Callback0::Type* callback) {
   command_processed_callback_.reset(callback);
 }
 
-GpuScheduler::GpuScheduler(CommandBuffer* command_buffer,
-                           gles2::GLES2Decoder* decoder,
-                           CommandParser* parser)
-    : command_buffer_(command_buffer),
-      decoder_(decoder),
-      parser_(parser),
-      unscheduled_count_(0),
-#if defined(OS_MACOSX)
-      swap_buffers_count_(0),
-      acknowledged_swap_buffers_count_(0),
-#endif
-      method_factory_(ALLOW_THIS_IN_INITIALIZER_LIST(this)) {
-}
-
 }  // namespace gpu
diff --git a/gpu/command_buffer/service/gpu_scheduler.h b/gpu/command_buffer/service/gpu_scheduler.h
index 72ffe26..32b072c 100644
--- a/gpu/command_buffer/service/gpu_scheduler.h
+++ b/gpu/command_buffer/service/gpu_scheduler.h
@@ -5,77 +5,29 @@
 #ifndef GPU_COMMAND_BUFFER_SERVICE_GPU_SCHEDULER_H_
 #define GPU_COMMAND_BUFFER_SERVICE_GPU_SCHEDULER_H_
 
-#include <map>
-#include <queue>
-#include <vector>
-
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/shared_memory.h"
-#include "base/task.h"
 #include "gpu/command_buffer/common/command_buffer.h"
 #include "gpu/command_buffer/service/cmd_buffer_engine.h"
 #include "gpu/command_buffer/service/cmd_parser.h"
 #include "gpu/command_buffer/service/gles2_cmd_decoder.h"
-#include "ui/gfx/native_widget_types.h"
-#include "ui/gfx/size.h"
-#include "ui/gfx/surface/transport_dib.h"
-
-#if defined(OS_MACOSX)
-#include "ui/gfx/surface/accelerated_surface_mac.h"
-#endif
-
-namespace gfx {
-class GLContext;
-class GLShareGroup;
-class GLSurface;
-}
 
 namespace gpu {
-namespace gles2 {
-class ContextGroup;
-}
 
-// This class processes commands in a command buffer. It is event driven and
-// posts tasks to the current message loop to do additional work.
+// This class schedules commands that have been flushed. They are received via
+// a command buffer and forwarded to a command parser. TODO(apatrick): This
+// class should not know about the decoder. Do not add additional dependencies
+// on it.
 class GpuScheduler : public CommandBufferEngine {
  public:
-  // If a group is not passed in one will be created.
-  static GpuScheduler* Create(CommandBuffer* command_buffer,
-                              gles2::ContextGroup* group);
-
-  // This constructor is for unit tests.
-  static GpuScheduler* CreateForTests(CommandBuffer* command_buffer,
-                                      gles2::GLES2Decoder* decoder,
-                                      CommandParser* parser);
+  GpuScheduler(CommandBuffer* command_buffer,
+               gles2::GLES2Decoder* decoder,
+               CommandParser* parser);
 
   virtual ~GpuScheduler();
 
-  // Platform specific code to create GLContexts and GLSurfaces that are
-  // handed off to the next function.
-  bool Initialize(gfx::PluginWindowHandle hwnd,
-                  const gfx::Size& size,
-                  bool software,
-                  const gles2::DisallowedExtensions& disallowed_extensions,
-                  const char* allowed_extensions,
-                  const std::vector<int32>& attribs,
-                  gfx::GLShareGroup* share_group);
-
-  // Takes ownership of GLSurface and GLContext.
-  bool InitializeCommon(
-      const scoped_refptr<gfx::GLSurface>& surface,
-      const scoped_refptr<gfx::GLContext>& context,
-      const gfx::Size& size,
-      const gles2::DisallowedExtensions& disallowed_extensions,
-      const char* allowed_extensions,
-      const std::vector<int32>& attribs);
-
-  void Destroy();
-  void DestroyCommon();
-
-  bool SetParent(GpuScheduler* parent_scheduler, uint32 parent_texture_id);
-
   void PutChanged();
 
   // Sets whether commands should be processed by this scheduler. Setting to
@@ -97,84 +49,29 @@ class GpuScheduler : public CommandBufferEngine {
   virtual bool SetGetOffset(int32 offset);
   virtual int32 GetGetOffset();
 
-#if defined(OS_MACOSX)
-  // To prevent the GPU process from overloading the browser process,
-  // we need to track the number of swap buffers calls issued and
-  // acknowledged per on-screen context, and keep the GPU from getting
-  // too far ahead of the browser. Note that this
-  // is also predicated on a flow control mechanism between the
-  // renderer and GPU processes.
-  uint64 swap_buffers_count() const;
-  uint64 acknowledged_swap_buffers_count() const;
-  void set_acknowledged_swap_buffers_count(
-      uint64 acknowledged_swap_buffers_count);
-
-  // Needed only on Mac OS X, which does not render into an on-screen
-  // window and therefore requires the backing store to be resized
-  // manually. Returns an opaque identifier for the new backing store.
-  // There are two versions of this method: one for use with the IOSurface
-  // available in Mac OS X 10.6; and, one for use with the
-  // TransportDIB-based version used on Mac OS X 10.5.
-  virtual uint64 SetWindowSizeForIOSurface(const gfx::Size& size);
-  virtual TransportDIB::Handle SetWindowSizeForTransportDIB(
-      const gfx::Size& size);
-  virtual void SetTransportDIBAllocAndFree(
-      Callback2<size_t, TransportDIB::Handle*>::Type* allocator,
-      Callback1<TransportDIB::Id>::Type* deallocator);
-  // Returns the id of the current surface that is being rendered to
-  // (or 0 if no such surface has been created).
-  virtual uint64 GetSurfaceId();
-
-  void DidDestroySurface();
-
-  // Sets a callback which is called when a SwapBuffers command is processed.
-  // Must be called after Initialize().
-  // It is not defined on which thread this callback is called.
-  void SetSwapBuffersCallback(Callback0::Type* callback);
-#endif
-
-  // Sets a callback that is called when a glResizeCHROMIUM command
-  // is processed.
-  void SetResizeCallback(Callback1<gfx::Size>::Type* callback);
-
   void SetCommandProcessedCallback(Callback0::Type* callback);
 
-  // Get the GLES2Decoder associated with this scheduler.
-  gles2::GLES2Decoder* decoder() const { return decoder_.get(); }
-
  private:
-  // If a group is not passed in one will be created.
-  GpuScheduler(CommandBuffer* command_buffer,
-               gles2::GLES2Decoder* decoder,
-               CommandParser* parser);
-
-#if defined(OS_MACOSX)
-  // Called via a callback just before we are supposed to call the
-  // user's swap buffers callback.
-  void WillSwapBuffers();
-#endif
 
   // The GpuScheduler holds a weak reference to the CommandBuffer. The
   // CommandBuffer owns the GpuScheduler and holds a strong reference to it
   // through the ProcessCommands callback.
   CommandBuffer* command_buffer_;
 
-  scoped_ptr<gles2::GLES2Decoder> decoder_;
+  // Does not own decoder. TODO(apatrick): The GpuScheduler shouldn't need a
+  // pointer to the decoder, it is only used to initialize the CommandParser,
+  // which could be an argument to the constructor, and to determine the
+  // reason for context lost.
+  gles2::GLES2Decoder* decoder_;
+
+  // TODO(apatrick): The GpuScheduler currently creates and owns the parser.
+  // This should be an argument to the constructor.
   scoped_ptr<CommandParser> parser_;
 
   // Greater than zero if this is waiting to be rescheduled before continuing.
   int unscheduled_count_;
 
   scoped_ptr<Callback0::Type> scheduled_callback_;
-
-#if defined(OS_MACOSX)
-  uint64 swap_buffers_count_;
-  uint64 acknowledged_swap_buffers_count_;
-  scoped_ptr<AcceleratedSurface> surface_;
-  scoped_ptr<Callback0::Type> wrapped_swap_buffers_callback_;
-#endif
-
-  ScopedRunnableMethodFactory<GpuScheduler> method_factory_;
   scoped_ptr<Callback0::Type> command_processed_callback_;
 };
 
diff --git a/gpu/command_buffer/service/gpu_scheduler_linux.cc b/gpu/command_buffer/service/gpu_scheduler_linux.cc
deleted file mode 100644
index 7cb7689..0000000
--- a/gpu/command_buffer/service/gpu_scheduler_linux.cc
+++ /dev/null
@@ -1,61 +0,0 @@
-// 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/command_buffer/service/gpu_scheduler.h"
-#include "ui/gfx/gl/gl_context.h"
-#include "ui/gfx/gl/gl_share_group.h"
-#include "ui/gfx/gl/gl_surface.h"
-
-using ::base::SharedMemory;
-
-namespace gpu {
-
-bool GpuScheduler::Initialize(
-    gfx::PluginWindowHandle window,
-    const gfx::Size& size,
-    bool software,
-    const gles2::DisallowedExtensions& disallowed_extensions,
-    const char* allowed_extensions,
-    const std::vector<int32>& attribs,
-    gfx::GLShareGroup* share_group) {
-#if defined(TOUCH_UI)
-  NOTIMPLEMENTED();
-  return false;
-#endif
-
-  // Create either a view or pbuffer based GLSurface.
-  scoped_refptr<gfx::GLSurface> surface;
-  if (window)
-    surface = gfx::GLSurface::CreateViewGLSurface(software, window);
-  else
-    surface = gfx::GLSurface::CreateOffscreenGLSurface(software,
-                                                       gfx::Size(1, 1));
-  if (!surface.get()) {
-    LOG(ERROR) << "GpuScheduler::Initialize failed.\n";
-    Destroy();
-    return false;
-  }
-
-  // Create a GLContext and attach the surface.
-  scoped_refptr<gfx::GLContext> context(
-      gfx::GLContext::CreateGLContext(share_group, surface.get()));
-  if (!context.get()) {
-    LOG(ERROR) << "CreateGLContext failed.\n";
-    Destroy();
-    return false;
-  }
-
-  return InitializeCommon(surface,
-                          context,
-                          size,
-                          disallowed_extensions,
-                          allowed_extensions,
-                          attribs);
-}
-
-void GpuScheduler::Destroy() {
-  DestroyCommon();
-}
-
-}  // namespace gpu
diff --git a/gpu/command_buffer/service/gpu_scheduler_mac.cc b/gpu/command_buffer/service/gpu_scheduler_mac.cc
deleted file mode 100644
index b172db7..0000000
--- a/gpu/command_buffer/service/gpu_scheduler_mac.cc
+++ /dev/null
@@ -1,147 +0,0 @@
-// 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/command_buffer/service/gpu_scheduler.h"
-#include "ui/gfx/gl/gl_context.h"
-#include "ui/gfx/gl/gl_share_group.h"
-#include "ui/gfx/gl/gl_surface.h"
-
-using ::base::SharedMemory;
-
-namespace gpu {
-
-bool GpuScheduler::Initialize(
-    gfx::PluginWindowHandle window,
-    const gfx::Size& size,
-    bool software,
-    const gles2::DisallowedExtensions& disallowed_extensions,
-    const char* allowed_extensions,
-    const std::vector<int32>& attribs,
-    gfx::GLShareGroup* share_group) {
-  scoped_refptr<gfx::GLSurface> surface(
-      gfx::GLSurface::CreateOffscreenGLSurface(software, gfx::Size(1, 1)));
-  if (!surface.get()) {
-    LOG(ERROR) << "CreateOffscreenGLSurface failed.\n";
-    Destroy();
-    return false;
-  }
-
-  // Create a GLContext and attach the surface.
-  scoped_refptr<gfx::GLContext> context(
-      gfx::GLContext::CreateGLContext(share_group, surface.get()));
-  if (!context.get()) {
-    LOG(ERROR) << "CreateGLContext failed.\n";
-    Destroy();
-    return false;
-  }
-
-  // On Mac OS X since we can not render on-screen we don't even
-  // attempt to create a view based GLContext. The only difference
-  // between "on-screen" and "off-screen" rendering on this platform
-  // is whether we allocate an AcceleratedSurface, which transmits the
-  // rendering results back to the browser.
-  if (window) {
-    surface_.reset(new AcceleratedSurface());
-
-    // Note that although the GLContext is passed to Initialize and the
-    // GLContext will later be owned by the decoder, AcceleratedSurface does
-    // not hold on to the reference. It simply extracts the underlying GL
-    // context in order to share the namespace with another context.
-    if (!surface_->Initialize(context.get(), false)) {
-      LOG(ERROR) << "GpuScheduler::Initialize failed to "
-                 << "initialize AcceleratedSurface.";
-      Destroy();
-      return false;
-    }
-  }
-
-  return InitializeCommon(surface,
-                          context,
-                          size,
-                          disallowed_extensions,
-                          allowed_extensions,
-                          attribs);
-}
-
-void GpuScheduler::Destroy() {
-  if (surface_.get()) {
-    surface_->Destroy();
-    surface_.reset();
-  }
-
-  DestroyCommon();
-}
-
-uint64 GpuScheduler::SetWindowSizeForIOSurface(const gfx::Size& size) {
-  // Note: The following line changes the current context again.
-  return surface_->SetSurfaceSize(size);
-}
-
-TransportDIB::Handle GpuScheduler::SetWindowSizeForTransportDIB(
-    const gfx::Size& size) {
-  return surface_->SetTransportDIBSize(size);
-}
-
-void GpuScheduler::SetTransportDIBAllocAndFree(
-      Callback2<size_t, TransportDIB::Handle*>::Type* allocator,
-      Callback1<TransportDIB::Id>::Type* deallocator) {
-  surface_->SetTransportDIBAllocAndFree(allocator, deallocator);
-}
-
-uint64 GpuScheduler::GetSurfaceId() {
-  if (!surface_.get())
-    return 0;
-  return surface_->GetSurfaceId();
-}
-
-uint64 GpuScheduler::swap_buffers_count() const {
-  return swap_buffers_count_;
-}
-
-uint64 GpuScheduler::acknowledged_swap_buffers_count() const {
-  return acknowledged_swap_buffers_count_;
-}
-
-void GpuScheduler::set_acknowledged_swap_buffers_count(
-    uint64 acknowledged_swap_buffers_count) {
-  acknowledged_swap_buffers_count_ = acknowledged_swap_buffers_count;
-}
-
-void GpuScheduler::DidDestroySurface() {
-  // When a browser window with a GpuScheduler is closed, the render process
-  // will attempt to finish all GL commands, it will busy-wait on the GPU
-  // process until the command queue is empty. If a paint is pending, the GPU
-  // process won't process any GL commands until the browser sends a paint ack,
-  // but since the browser window is already closed, it will never arrive.
-  // To break this infinite loop, the browser tells the GPU process that the
-  // surface became invalid, which causes the GPU process to not wait for paint
-  // acks.
-  surface_.reset();
-}
-
-void GpuScheduler::SetSwapBuffersCallback(
-    Callback0::Type* callback) {
-  wrapped_swap_buffers_callback_.reset(callback);
-  decoder_->SetSwapBuffersCallback(
-      NewCallback(this,
-                  &GpuScheduler::WillSwapBuffers));
-}
-
-void GpuScheduler::WillSwapBuffers() {
-  DCHECK(decoder_.get());
-  DCHECK(decoder_->GetGLContext());
-  DCHECK(decoder_->GetGLContext()->IsCurrent(decoder_->GetGLSurface()));
-
-  ++swap_buffers_count_;
-
-  if (surface_.get()) {
-    surface_->SwapBuffers();
-  }
-
-  if (wrapped_swap_buffers_callback_.get()) {
-    wrapped_swap_buffers_callback_->Run();
-  }
-}
-
-}  // namespace gpu
diff --git a/gpu/command_buffer/service/gpu_scheduler_unittest.cc b/gpu/command_buffer/service/gpu_scheduler_unittest.cc
index 4fb54b4..ce4fa11 100644
--- a/gpu/command_buffer/service/gpu_scheduler_unittest.cc
+++ b/gpu/command_buffer/service/gpu_scheduler_unittest.cc
@@ -46,7 +46,7 @@ class GpuSchedulerTest : public testing::Test {
 
     async_api_.reset(new StrictMock<AsyncAPIMock>);
 
-    decoder_ = new gles2::MockGLES2Decoder();
+    decoder_.reset(new gles2::MockGLES2Decoder());
 
     parser_ = new CommandParser(buffer_,
                                 kRingBufferEntries,
@@ -55,13 +55,9 @@ class GpuSchedulerTest : public testing::Test {
                                 0,
                                 async_api_.get());
 
-    scheduler_.reset(gpu::GpuScheduler::CreateForTests(command_buffer_.get(),
-                                                       decoder_,
-                                                       parser_));
-
-    EXPECT_CALL(*decoder_, Destroy())
-      .Times(1)
-      .RetiresOnSaturation();
+    scheduler_.reset(new gpu::GpuScheduler(command_buffer_.get(),
+                                           decoder_.get(),
+                                           parser_));
   }
 
   virtual void TearDown() {
@@ -80,7 +76,7 @@ class GpuSchedulerTest : public testing::Test {
   scoped_ptr<base::SharedMemory> shared_memory_;
   Buffer shared_memory_buffer_;
   int32* buffer_;
-  gles2::MockGLES2Decoder* decoder_;
+  scoped_ptr<gles2::MockGLES2Decoder> decoder_;
   CommandParser* parser_;
   scoped_ptr<AsyncAPIMock> async_api_;
   scoped_ptr<GpuScheduler> scheduler_;
@@ -146,19 +142,6 @@ TEST_F(GpuSchedulerTest, ProcessesTwoCommands) {
   scheduler_->PutChanged();
 }
 
-TEST_F(GpuSchedulerTest, SchedulerSetsTheGLContext) {
-  EXPECT_CALL(*decoder_, MakeCurrent())
-    .WillOnce(Return(true))
-    .WillOnce(Return(true));
-
-  CommandBuffer::State state;
-  state.put_offset = 0;
-  EXPECT_CALL(*command_buffer_, GetState())
-    .WillRepeatedly(Return(state));
-
-  scheduler_->PutChanged();
-}
-
 TEST_F(GpuSchedulerTest, SetsErrorCodeOnCommandBuffer) {
   CommandHeader* header = reinterpret_cast<CommandHeader*>(&buffer_[0]);
   header[0].command = 7;
diff --git a/gpu/command_buffer/service/gpu_scheduler_win.cc b/gpu/command_buffer/service/gpu_scheduler_win.cc
deleted file mode 100644
index 72a463b..0000000
--- a/gpu/command_buffer/service/gpu_scheduler_win.cc
+++ /dev/null
@@ -1,60 +0,0 @@
-// 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 <windows.h>
-
-#include "gpu/command_buffer/service/gpu_scheduler.h"
-#include "ui/gfx/gl/gl_context.h"
-#include "ui/gfx/gl/gl_share_group.h"
-#include "ui/gfx/gl/gl_surface.h"
-
-using ::base::SharedMemory;
-
-namespace gpu {
-
-bool GpuScheduler::Initialize(
-    gfx::PluginWindowHandle window,
-    const gfx::Size& size,
-    bool software,
-    const gles2::DisallowedExtensions& disallowed_extensions,
-    const char* allowed_extensions,
-    const std::vector<int32>& attribs,
-    gfx::GLShareGroup* share_group) {
-  // Create either a view or pbuffer based GLSurface.
-  scoped_refptr<gfx::GLSurface> surface;
-  if (window) {
-    surface = gfx::GLSurface::CreateViewGLSurface(software, window);
-  } else {
-    surface = gfx::GLSurface::CreateOffscreenGLSurface(software,
-                                                       gfx::Size(1, 1));
-  }
-
-  if (!surface.get()) {
-    LOG(ERROR) << "GpuScheduler::Initialize failed.\n";
-    Destroy();
-    return false;
-  }
-
-  // Create a GLContext and attach the surface.
-  scoped_refptr<gfx::GLContext> context(
-      gfx::GLContext::CreateGLContext(share_group, surface.get()));
-  if (!context.get()) {
-    LOG(ERROR) << "CreateGLContext failed.\n";
-    Destroy();
-    return false;
-  }
-
-  return InitializeCommon(surface,
-                          context,
-                          size,
-                          disallowed_extensions,
-                          allowed_extensions,
-                          attribs);
-}
-
-void GpuScheduler::Destroy() {
-  DestroyCommon();
-}
-
-}  // namespace gpu