Use GLES2Interface for shaders and programs

This uses the gpu::gles2::GLES2Interface type in the gl renderer's shader
and program code instead of WebGraphicsContext3D. For production code, the
GLES2Interface is a direct interface to the real command buffer in use. For
cc_unittests, the GLES2Interface is a stub that wraps TestWebGraphicsContext3D
so we can continue to use the same stubs/mocks for now. Once we port all of
the production code over to using GLES2Interface we should port the test context
classes over to the new base interface.

BUG=181120

Review URL: https://codereview.chromium.org/93433004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@239405 0039d316-1c4b-4281-b951-d872f2087c98

8 files changed, 180 insertions, 168 deletions

diff --git a/cc/output/context_provider.h b/cc/output/context_provider.h
index 09b1835..d615d17 100644
--- a/cc/output/context_provider.h
+++ b/cc/output/context_provider.h
@@ -11,6 +11,7 @@
 #include "gpu/command_buffer/common/capabilities.h"
 
 class GrContext;
+
 namespace blink { class WebGraphicsContext3D; }
 namespace gpu {
 class ContextSupport;
diff --git a/cc/output/gl_renderer.cc b/cc/output/gl_renderer.cc
index 89b8c04..15cb3a2 100644
--- a/cc/output/gl_renderer.cc
+++ b/cc/output/gl_renderer.cc
@@ -38,6 +38,7 @@
 #include "cc/trees/single_thread_proxy.h"
 #include "gpu/GLES2/gl2extchromium.h"
 #include "gpu/command_buffer/client/context_support.h"
+#include "gpu/command_buffer/client/gles2_interface.h"
 #include "gpu/command_buffer/common/gpu_memory_allocation.h"
 #include "third_party/WebKit/public/platform/WebGraphicsContext3D.h"
 #include "third_party/khronos/GLES2/gl2.h"
@@ -170,6 +171,7 @@ GLRenderer::GLRenderer(RendererClient* client,
       offscreen_framebuffer_id_(0),
       shared_geometry_quad_(gfx::RectF(-0.5f, -0.5f, 1.0f, 1.0f)),
       context_(output_surface->context_provider()->Context3d()),
+      gl_(output_surface->context_provider()->ContextGL()),
       context_support_(output_surface->context_provider()->ContextSupport()),
       texture_mailbox_deleter_(texture_mailbox_deleter),
       is_backbuffer_discarded_(false),
@@ -956,7 +958,7 @@ void GLRenderer::DrawRenderPassQuad(DrawingFrame* frame,
   }
 
   TexCoordPrecision tex_coord_precision = TexCoordPrecisionRequired(
-      context_, &highp_threshold_cache_, highp_threshold_min_,
+      gl_, &highp_threshold_cache_, highp_threshold_min_,
       quad->shared_quad_state->visible_content_rect.bottom_right());
 
   int shader_quad_location = -1;
@@ -1462,7 +1464,7 @@ void GLRenderer::DrawContentQuad(const DrawingFrame* frame,
   float vertex_tex_scale_y = tile_rect.height() / clamp_geom_rect.height();
 
   TexCoordPrecision tex_coord_precision = TexCoordPrecisionRequired(
-      context_, &highp_threshold_cache_, highp_threshold_min_,
+      gl_, &highp_threshold_cache_, highp_threshold_min_,
       quad->texture_size);
 
   gfx::Transform device_transform =
@@ -1605,7 +1607,7 @@ void GLRenderer::DrawYUVVideoQuad(const DrawingFrame* frame,
   SetBlendEnabled(quad->ShouldDrawWithBlending());
 
   TexCoordPrecision tex_coord_precision = TexCoordPrecisionRequired(
-      context_, &highp_threshold_cache_, highp_threshold_min_,
+      gl_, &highp_threshold_cache_, highp_threshold_min_,
       quad->shared_quad_state->visible_content_rect.bottom_right());
 
   bool use_alpha_plane = quad->a_plane_resource_id != 0;
@@ -1718,7 +1720,7 @@ void GLRenderer::DrawStreamVideoQuad(const DrawingFrame* frame,
   DCHECK(capabilities_.using_egl_image);
 
   TexCoordPrecision tex_coord_precision = TexCoordPrecisionRequired(
-      context_, &highp_threshold_cache_, highp_threshold_min_,
+      gl_, &highp_threshold_cache_, highp_threshold_min_,
       quad->shared_quad_state->visible_content_rect.bottom_right());
 
   const VideoStreamTextureProgram* program =
@@ -1900,7 +1902,7 @@ void GLRenderer::FlushTextureQuadCache() {
 void GLRenderer::EnqueueTextureQuad(const DrawingFrame* frame,
                                     const TextureDrawQuad* quad) {
   TexCoordPrecision tex_coord_precision = TexCoordPrecisionRequired(
-      context_, &highp_threshold_cache_, highp_threshold_min_,
+      gl_, &highp_threshold_cache_, highp_threshold_min_,
       quad->shared_quad_state->visible_content_rect.bottom_right());
 
   // Choose the correct texture program binding
@@ -1965,7 +1967,7 @@ void GLRenderer::DrawIOSurfaceQuad(const DrawingFrame* frame,
   SetBlendEnabled(quad->ShouldDrawWithBlending());
 
   TexCoordPrecision tex_coord_precision = TexCoordPrecisionRequired(
-      context_,  &highp_threshold_cache_, highp_threshold_min_,
+      gl_,  &highp_threshold_cache_, highp_threshold_min_,
       quad->shared_quad_state->visible_content_rect.bottom_right());
 
   TexTransformTextureProgramBinding binding;
@@ -2097,7 +2099,7 @@ void GLRenderer::SetBlendEnabled(bool enabled) {
 void GLRenderer::SetUseProgram(unsigned program) {
   if (program == program_shadow_)
     return;
-  GLC(context_, context_->useProgram(program));
+  gl_->UseProgram(program);
   program_shadow_ = program;
 }
 
@@ -2121,7 +2123,7 @@ void GLRenderer::CopyTextureToFramebuffer(const DrawingFrame* frame,
                                           const gfx::Transform& draw_matrix,
                                           bool flip_vertically) {
   TexCoordPrecision tex_coord_precision = TexCoordPrecisionRequired(
-      context_, &highp_threshold_cache_, highp_threshold_min_,
+      gl_, &highp_threshold_cache_, highp_threshold_min_,
       rect.bottom_right());
 
   const RenderPassProgram* program = GetRenderPassProgram(tex_coord_precision);
@@ -3016,39 +3018,39 @@ void GLRenderer::CleanupSharedObjects() {
 
   for (int i = 0; i < NumTexCoordPrecisions; ++i) {
     for (int j = 0; j < NumSamplerTypes; ++j) {
-      tile_program_[i][j].Cleanup(context_);
-      tile_program_opaque_[i][j].Cleanup(context_);
-      tile_program_swizzle_[i][j].Cleanup(context_);
-      tile_program_swizzle_opaque_[i][j].Cleanup(context_);
-      tile_program_aa_[i][j].Cleanup(context_);
-      tile_program_swizzle_aa_[i][j].Cleanup(context_);
+      tile_program_[i][j].Cleanup(gl_);
+      tile_program_opaque_[i][j].Cleanup(gl_);
+      tile_program_swizzle_[i][j].Cleanup(gl_);
+      tile_program_swizzle_opaque_[i][j].Cleanup(gl_);
+      tile_program_aa_[i][j].Cleanup(gl_);
+      tile_program_swizzle_aa_[i][j].Cleanup(gl_);
     }
 
-    render_pass_mask_program_[i].Cleanup(context_);
-    render_pass_program_[i].Cleanup(context_);
-    render_pass_mask_program_aa_[i].Cleanup(context_);
-    render_pass_program_aa_[i].Cleanup(context_);
-    render_pass_color_matrix_program_[i].Cleanup(context_);
-    render_pass_mask_color_matrix_program_aa_[i].Cleanup(context_);
-    render_pass_color_matrix_program_aa_[i].Cleanup(context_);
-    render_pass_mask_color_matrix_program_[i].Cleanup(context_);
+    render_pass_mask_program_[i].Cleanup(gl_);
+    render_pass_program_[i].Cleanup(gl_);
+    render_pass_mask_program_aa_[i].Cleanup(gl_);
+    render_pass_program_aa_[i].Cleanup(gl_);
+    render_pass_color_matrix_program_[i].Cleanup(gl_);
+    render_pass_mask_color_matrix_program_aa_[i].Cleanup(gl_);
+    render_pass_color_matrix_program_aa_[i].Cleanup(gl_);
+    render_pass_mask_color_matrix_program_[i].Cleanup(gl_);
 
-    texture_program_[i].Cleanup(context_);
-    nonpremultiplied_texture_program_[i].Cleanup(context_);
-    texture_background_program_[i].Cleanup(context_);
-    nonpremultiplied_texture_background_program_[i].Cleanup(context_);
-    texture_io_surface_program_[i].Cleanup(context_);
+    texture_program_[i].Cleanup(gl_);
+    nonpremultiplied_texture_program_[i].Cleanup(gl_);
+    texture_background_program_[i].Cleanup(gl_);
+    nonpremultiplied_texture_background_program_[i].Cleanup(gl_);
+    texture_io_surface_program_[i].Cleanup(gl_);
 
-    video_yuv_program_[i].Cleanup(context_);
-    video_yuva_program_[i].Cleanup(context_);
-    video_stream_texture_program_[i].Cleanup(context_);
+    video_yuv_program_[i].Cleanup(gl_);
+    video_yuva_program_[i].Cleanup(gl_);
+    video_stream_texture_program_[i].Cleanup(gl_);
   }
 
-  tile_checkerboard_program_.Cleanup(context_);
+  tile_checkerboard_program_.Cleanup(gl_);
 
-  debug_border_program_.Cleanup(context_);
-  solid_color_program_.Cleanup(context_);
-  solid_color_program_aa_.Cleanup(context_);
+  debug_border_program_.Cleanup(gl_);
+  solid_color_program_.Cleanup(gl_);
+  solid_color_program_aa_.Cleanup(gl_);
 
   if (offscreen_framebuffer_id_)
     GLC(context_, context_->deleteFramebuffer(offscreen_framebuffer_id_));
diff --git a/cc/output/gl_renderer.h b/cc/output/gl_renderer.h
index 85c0fa1..decb7d0 100644
--- a/cc/output/gl_renderer.h
+++ b/cc/output/gl_renderer.h
@@ -25,9 +25,14 @@ class SkBitmap;
 
 namespace blink { class WebGraphicsContext3D; }
 
+namespace gpu {
+namespace gles2 {
+class GLES2Interface;
+}
+}
+
 namespace cc {
 
-class ContextProvider;
 class GLRendererShaderTest;
 class OutputSurface;
 class PictureDrawQuad;
@@ -398,6 +403,7 @@ class CC_EXPORT GLRenderer : public DirectRenderer {
   SolidColorProgramAA solid_color_program_aa_;
 
   blink::WebGraphicsContext3D* context_;
+  gpu::gles2::GLES2Interface* gl_;
   gpu::ContextSupport* context_support_;
 
   skia::RefPtr<GrContext> gr_context_;
diff --git a/cc/output/program_binding.cc b/cc/output/program_binding.cc
index 210dc76..9152e5a 100644
--- a/cc/output/program_binding.cc
+++ b/cc/output/program_binding.cc
@@ -6,11 +6,10 @@
 
 #include "base/debug/trace_event.h"
 #include "cc/output/geometry_binding.h"
-#include "cc/output/gl_renderer.h"  // For the GLC() macro.
-#include "third_party/WebKit/public/platform/WebGraphicsContext3D.h"
+#include "gpu/command_buffer/client/gles2_interface.h"
 #include "third_party/khronos/GLES2/gl2.h"
 
-using blink::WebGraphicsContext3D;
+using gpu::gles2::GLES2Interface;
 
 namespace cc {
 
@@ -28,7 +27,7 @@ ProgramBindingBase::~ProgramBindingBase() {
   DCHECK(!initialized_);
 }
 
-bool ProgramBindingBase::Init(WebGraphicsContext3D* context,
+bool ProgramBindingBase::Init(GLES2Interface* context,
                               const std::string& vertex_shader,
                               const std::string& fragment_shader) {
   TRACE_EVENT0("cc", "ProgramBindingBase::init");
@@ -39,7 +38,7 @@ bool ProgramBindingBase::Init(WebGraphicsContext3D* context,
   fragment_shader_id_ =
       LoadShader(context, GL_FRAGMENT_SHADER, fragment_shader);
   if (!fragment_shader_id_) {
-    GLC(context, context->deleteShader(vertex_shader_id_));
+    context->DeleteShader(vertex_shader_id_);
     vertex_shader_id_ = 0;
     return false;
   }
@@ -49,91 +48,84 @@ bool ProgramBindingBase::Init(WebGraphicsContext3D* context,
   return !!program_;
 }
 
-bool ProgramBindingBase::Link(WebGraphicsContext3D* context) {
-  GLC(context, context->linkProgram(program_));
+bool ProgramBindingBase::Link(GLES2Interface* context) {
+  context->LinkProgram(program_);
   CleanupShaders(context);
   if (!program_)
     return false;
 #ifndef NDEBUG
   int linked = 0;
-  GLC(context, context->getProgramiv(program_, GL_LINK_STATUS, &linked));
-  if (!linked) {
-    GLC(context, context->deleteProgram(program_));
+  context->GetProgramiv(program_, GL_LINK_STATUS, &linked);
+  if (!linked)
     return false;
-  }
 #endif
   return true;
 }
 
-void ProgramBindingBase::Cleanup(WebGraphicsContext3D* context) {
-  if (!initialized_)
-    return;
-
+void ProgramBindingBase::Cleanup(GLES2Interface* context) {
   initialized_ = false;
   if (!program_)
     return;
 
   DCHECK(context);
-  GLC(context, context->deleteProgram(program_));
+  context->DeleteProgram(program_);
   program_ = 0;
 
   CleanupShaders(context);
 }
 
-unsigned ProgramBindingBase::LoadShader(WebGraphicsContext3D* context,
+unsigned ProgramBindingBase::LoadShader(GLES2Interface* context,
                                         unsigned type,
                                         const std::string& shader_source) {
-  unsigned shader = context->createShader(type);
+  unsigned shader = context->CreateShader(type);
   if (!shader)
-    return 0;
-  GLC(context, context->shaderSource(shader, shader_source.data()));
-  GLC(context, context->compileShader(shader));
+    return 0u;
+
+  const char* shader_source_str[] = { shader_source.data() };
+  int shader_length[] = { static_cast<int>(shader_source.length()) };
+  context->ShaderSource(
+      shader, 1,
+      shader_source_str,
+      shader_length);
+  context->CompileShader(shader);
 #ifndef NDEBUG
   int compiled = 0;
-  GLC(context, context->getShaderiv(shader, GL_COMPILE_STATUS, &compiled));
-  if (!compiled) {
-    GLC(context, context->deleteShader(shader));
-    return 0;
-  }
+  context->GetShaderiv(shader, GL_COMPILE_STATUS, &compiled);
+  if (!compiled)
+    return 0u;
 #endif
   return shader;
 }
 
-unsigned ProgramBindingBase::CreateShaderProgram(WebGraphicsContext3D* context,
+unsigned ProgramBindingBase::CreateShaderProgram(GLES2Interface* context,
                                                  unsigned vertex_shader,
                                                  unsigned fragment_shader) {
-  unsigned program_object = context->createProgram();
+  unsigned program_object = context->CreateProgram();
   if (!program_object)
     return 0;
 
-  GLC(context, context->attachShader(program_object, vertex_shader));
-  GLC(context, context->attachShader(program_object, fragment_shader));
+  context->AttachShader(program_object, vertex_shader);
+  context->AttachShader(program_object, fragment_shader);
 
   // Bind the common attrib locations.
-  GLC(context,
-      context->bindAttribLocation(program_object,
-                                  GeometryBinding::PositionAttribLocation(),
-                                  "a_position"));
-  GLC(context,
-      context->bindAttribLocation(program_object,
-                                  GeometryBinding::TexCoordAttribLocation(),
-                                  "a_texCoord"));
-  GLC(context,
-      context->bindAttribLocation(
-          program_object,
-          GeometryBinding::TriangleIndexAttribLocation(),
-          "a_index"));
+  context->BindAttribLocation(
+      program_object, GeometryBinding::PositionAttribLocation(), "a_position");
+  context->BindAttribLocation(
+      program_object, GeometryBinding::TexCoordAttribLocation(), "a_texCoord");
+  context->BindAttribLocation(program_object,
+                              GeometryBinding::TriangleIndexAttribLocation(),
+                              "a_index");
 
   return program_object;
 }
 
-void ProgramBindingBase::CleanupShaders(WebGraphicsContext3D* context) {
+void ProgramBindingBase::CleanupShaders(GLES2Interface* context) {
   if (vertex_shader_id_) {
-    GLC(context, context->deleteShader(vertex_shader_id_));
+    context->DeleteShader(vertex_shader_id_);
     vertex_shader_id_ = 0;
   }
   if (fragment_shader_id_) {
-    GLC(context, context->deleteShader(fragment_shader_id_));
+    context->DeleteShader(fragment_shader_id_);
     fragment_shader_id_ = 0;
   }
 }
diff --git a/cc/output/program_binding.h b/cc/output/program_binding.h
index 4a75a01..912329e 100644
--- a/cc/output/program_binding.h
+++ b/cc/output/program_binding.h
@@ -11,7 +11,11 @@
 #include "cc/output/context_provider.h"
 #include "cc/output/shader.h"
 
-namespace blink { class WebGraphicsContext3D; }
+namespace gpu {
+namespace gles2 {
+class GLES2Interface;
+}
+}
 
 namespace cc {
 
@@ -20,23 +24,23 @@ class ProgramBindingBase {
   ProgramBindingBase();
   ~ProgramBindingBase();
 
-  bool Init(blink::WebGraphicsContext3D* context,
+  bool Init(gpu::gles2::GLES2Interface* context,
             const std::string& vertex_shader,
             const std::string& fragment_shader);
-  bool Link(blink::WebGraphicsContext3D* context);
-  void Cleanup(blink::WebGraphicsContext3D* context);
+  bool Link(gpu::gles2::GLES2Interface* context);
+  void Cleanup(gpu::gles2::GLES2Interface* context);
 
   unsigned program() const { return program_; }
   bool initialized() const { return initialized_; }
 
  protected:
-  unsigned LoadShader(blink::WebGraphicsContext3D* context,
+  unsigned LoadShader(gpu::gles2::GLES2Interface* context,
                       unsigned type,
                       const std::string& shader_source);
-  unsigned CreateShaderProgram(blink::WebGraphicsContext3D* context,
+  unsigned CreateShaderProgram(gpu::gles2::GLES2Interface* context,
                                unsigned vertex_shader,
                                unsigned fragment_shader);
-  void CleanupShaders(blink::WebGraphicsContext3D* context);
+  void CleanupShaders(gpu::gles2::GLES2Interface* context);
 
   unsigned program_;
   unsigned vertex_shader_id_;
@@ -62,7 +66,7 @@ class ProgramBinding : public ProgramBindingBase {
       return;
 
     if (!ProgramBindingBase::Init(
-            context_provider->Context3d(),
+            context_provider->ContextGL(),
             vertex_shader_.GetShaderString(),
             fragment_shader_.GetShaderString(precision, sampler))) {
       DCHECK(context_provider->IsContextLost());
@@ -70,13 +74,13 @@ class ProgramBinding : public ProgramBindingBase {
     }
 
     int base_uniform_index = 0;
-    vertex_shader_.Init(context_provider->Context3d(),
+    vertex_shader_.Init(context_provider->ContextGL(),
                         program_, &base_uniform_index);
-    fragment_shader_.Init(context_provider->Context3d(),
+    fragment_shader_.Init(context_provider->ContextGL(),
                           program_, &base_uniform_index);
 
     // Link after binding uniforms
-    if (!Link(context_provider->Context3d())) {
+    if (!Link(context_provider->ContextGL())) {
       DCHECK(context_provider->IsContextLost());
       return;
     }
diff --git a/cc/output/shader.cc b/cc/output/shader.cc
index 501c00d..b752f46 100644
--- a/cc/output/shader.cc
+++ b/cc/output/shader.cc
@@ -9,7 +9,7 @@
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "cc/output/gl_renderer.h"  // For the GLC() macro.
-#include "third_party/WebKit/public/platform/WebGraphicsContext3D.h"
+#include "gpu/command_buffer/client/gles2_interface.h"
 #include "third_party/khronos/GLES2/gl2.h"
 
 #define SHADER0(Src) #Src
@@ -17,13 +17,13 @@
 #define FRAGMENT_SHADER(Src) SetFragmentTexCoordPrecision( \
     precision, SetFragmentSamplerType(sampler, SHADER0(Src)))
 
-using blink::WebGraphicsContext3D;
+using gpu::gles2::GLES2Interface;
 
 namespace cc {
 
 namespace {
 
-static void GetProgramUniformLocations(WebGraphicsContext3D* context,
+static void GetProgramUniformLocations(GLES2Interface* context,
                                        unsigned program,
                                        size_t count,
                                        const char** uniforms,
@@ -31,7 +31,7 @@ static void GetProgramUniformLocations(WebGraphicsContext3D* context,
                                        int* base_uniform_index) {
   for (size_t i = 0; i < count; i++) {
     locations[i] = (*base_uniform_index)++;
-    context->bindUniformLocationCHROMIUM(program, locations[i], uniforms[i]);
+    context->BindUniformLocationCHROMIUM(program, locations[i], uniforms[i]);
   }
 }
 
@@ -72,7 +72,7 @@ static std::string SetVertexTexCoordPrecision(const char* shader_string) {
       std::string(shader_string);
 }
 
-TexCoordPrecision TexCoordPrecisionRequired(WebGraphicsContext3D* context,
+TexCoordPrecision TexCoordPrecisionRequired(GLES2Interface* context,
                                             int *highp_threshold_cache,
                                             int highp_threshold_min,
                                             int x, int y) {
@@ -83,7 +83,7 @@ TexCoordPrecision TexCoordPrecisionRequired(WebGraphicsContext3D* context,
     // everywhere.
     GLint range[2] = { 14, 14 };
     GLint precision = 10;
-    GLC(context, context->getShaderPrecisionFormat(GL_FRAGMENT_SHADER,
+    GLC(context, context->GetShaderPrecisionFormat(GL_FRAGMENT_SHADER,
                                                    GL_MEDIUM_FLOAT,
                                                    range, &precision));
     *highp_threshold_cache = 1 << precision;
@@ -134,7 +134,7 @@ static std::string SetFragmentSamplerType(
 
 }  // namespace
 
-TexCoordPrecision TexCoordPrecisionRequired(WebGraphicsContext3D* context,
+TexCoordPrecision TexCoordPrecisionRequired(GLES2Interface* context,
                                             int *highp_threshold_cache,
                                             int highp_threshold_min,
                                             gfx::Point max_coordinate) {
@@ -143,7 +143,7 @@ TexCoordPrecision TexCoordPrecisionRequired(WebGraphicsContext3D* context,
                                    max_coordinate.x(), max_coordinate.y());
 }
 
-TexCoordPrecision TexCoordPrecisionRequired(WebGraphicsContext3D* context,
+TexCoordPrecision TexCoordPrecisionRequired(GLES2Interface* context,
                                             int *highp_threshold_cache,
                                             int highp_threshold_min,
                                             gfx::Size max_size) {
@@ -155,7 +155,7 @@ TexCoordPrecision TexCoordPrecisionRequired(WebGraphicsContext3D* context,
 VertexShaderPosTex::VertexShaderPosTex()
       : matrix_location_(-1) {}
 
-void VertexShaderPosTex::Init(WebGraphicsContext3D* context,
+void VertexShaderPosTex::Init(GLES2Interface* context,
                               unsigned program,
                               int* base_uniform_index) {
   static const char* uniforms[] = {
@@ -189,7 +189,7 @@ VertexShaderPosTexYUVStretch::VertexShaderPosTexYUVStretch()
     : matrix_location_(-1),
       tex_scale_location_(-1) {}
 
-void VertexShaderPosTexYUVStretch::Init(WebGraphicsContext3D* context,
+void VertexShaderPosTexYUVStretch::Init(GLES2Interface* context,
                                         unsigned program,
                                         int* base_uniform_index) {
   static const char* uniforms[] = {
@@ -226,7 +226,7 @@ std::string VertexShaderPosTexYUVStretch::GetShaderString() const {
 VertexShaderPos::VertexShaderPos()
     : matrix_location_(-1) {}
 
-void VertexShaderPos::Init(WebGraphicsContext3D* context,
+void VertexShaderPos::Init(GLES2Interface* context,
                            unsigned program,
                            int* base_uniform_index) {
   static const char* uniforms[] = {
@@ -258,7 +258,7 @@ VertexShaderPosTexTransform::VertexShaderPosTexTransform()
       tex_transform_location_(-1),
       vertex_opacity_location_(-1) {}
 
-void VertexShaderPosTexTransform::Init(WebGraphicsContext3D* context,
+void VertexShaderPosTexTransform::Init(GLES2Interface* context,
                                        unsigned program,
                                        int* base_uniform_index) {
   static const char* uniforms[] = {
@@ -314,7 +314,7 @@ VertexShaderQuad::VertexShaderQuad()
     : matrix_location_(-1),
       quad_location_(-1) {}
 
-void VertexShaderQuad::Init(WebGraphicsContext3D* context,
+void VertexShaderQuad::Init(GLES2Interface* context,
                             unsigned program,
                             int* base_uniform_index) {
   static const char* uniforms[] = {
@@ -371,7 +371,7 @@ VertexShaderQuadAA::VertexShaderQuadAA()
       quad_location_(-1),
       edge_location_(-1) {}
 
-void VertexShaderQuadAA::Init(WebGraphicsContext3D* context,
+void VertexShaderQuadAA::Init(GLES2Interface* context,
                             unsigned program,
                             int* base_uniform_index) {
   static const char* uniforms[] = {
@@ -428,7 +428,7 @@ VertexShaderQuadTexTransformAA::VertexShaderQuadTexTransformAA()
       edge_location_(-1),
       tex_transform_location_(-1) {}
 
-void VertexShaderQuadTexTransformAA::Init(WebGraphicsContext3D* context,
+void VertexShaderQuadTexTransformAA::Init(GLES2Interface* context,
                                         unsigned program,
                                         int* base_uniform_index) {
   static const char* uniforms[] = {
@@ -488,7 +488,7 @@ VertexShaderTile::VertexShaderTile()
       quad_location_(-1),
       vertex_tex_transform_location_(-1) {}
 
-void VertexShaderTile::Init(WebGraphicsContext3D* context,
+void VertexShaderTile::Init(GLES2Interface* context,
                             unsigned program,
                             int* base_uniform_index) {
   static const char* uniforms[] = {
@@ -532,7 +532,7 @@ VertexShaderTileAA::VertexShaderTileAA()
       edge_location_(-1),
       vertex_tex_transform_location_(-1) {}
 
-void VertexShaderTileAA::Init(WebGraphicsContext3D* context,
+void VertexShaderTileAA::Init(GLES2Interface* context,
                               unsigned program,
                               int* base_uniform_index) {
   static const char* uniforms[] = {
@@ -591,7 +591,7 @@ VertexShaderVideoTransform::VertexShaderVideoTransform()
     : matrix_location_(-1),
       tex_matrix_location_(-1) {}
 
-void VertexShaderVideoTransform::Init(WebGraphicsContext3D* context,
+void VertexShaderVideoTransform::Init(GLES2Interface* context,
                                       unsigned program,
                                       int* base_uniform_index) {
   static const char* uniforms[] = {
@@ -629,7 +629,7 @@ FragmentTexAlphaBinding::FragmentTexAlphaBinding()
     : sampler_location_(-1),
       alpha_location_(-1) {}
 
-void FragmentTexAlphaBinding::Init(WebGraphicsContext3D* context,
+void FragmentTexAlphaBinding::Init(GLES2Interface* context,
                                    unsigned program,
                                    int* base_uniform_index) {
   static const char* uniforms[] = {
@@ -654,7 +654,7 @@ FragmentTexColorMatrixAlphaBinding::FragmentTexColorMatrixAlphaBinding()
       color_matrix_location_(-1),
       color_offset_location_(-1) {}
 
-void FragmentTexColorMatrixAlphaBinding::Init(WebGraphicsContext3D* context,
+void FragmentTexColorMatrixAlphaBinding::Init(GLES2Interface* context,
                                               unsigned program,
                                               int* base_uniform_index) {
   static const char* uniforms[] = {
@@ -680,7 +680,7 @@ void FragmentTexColorMatrixAlphaBinding::Init(WebGraphicsContext3D* context,
 FragmentTexOpaqueBinding::FragmentTexOpaqueBinding()
     : sampler_location_(-1) {}
 
-void FragmentTexOpaqueBinding::Init(WebGraphicsContext3D* context,
+void FragmentTexOpaqueBinding::Init(GLES2Interface* context,
                                     unsigned program,
                                     int* base_uniform_index) {
   static const char* uniforms[] = {
@@ -766,7 +766,7 @@ FragmentTexBackgroundBinding::FragmentTexBackgroundBinding()
       sampler_location_(-1) {
 }
 
-void FragmentTexBackgroundBinding::Init(WebGraphicsContext3D* context,
+void FragmentTexBackgroundBinding::Init(GLES2Interface* context,
                                         unsigned program,
                                         int* base_uniform_index) {
   static const char* uniforms[] = {
@@ -879,7 +879,7 @@ FragmentShaderRGBATexAlphaAA::FragmentShaderRGBATexAlphaAA()
     : sampler_location_(-1),
       alpha_location_(-1) {}
 
-void FragmentShaderRGBATexAlphaAA::Init(WebGraphicsContext3D* context,
+void FragmentShaderRGBATexAlphaAA::Init(GLES2Interface* context,
                                         unsigned program,
                                         int* base_uniform_index) {
   static const char* uniforms[] = {
@@ -922,7 +922,7 @@ FragmentTexClampAlphaAABinding::FragmentTexClampAlphaAABinding()
       alpha_location_(-1),
       fragment_tex_transform_location_(-1) {}
 
-void FragmentTexClampAlphaAABinding::Init(WebGraphicsContext3D* context,
+void FragmentTexClampAlphaAABinding::Init(GLES2Interface* context,
                                           unsigned program,
                                           int* base_uniform_index) {
   static const char* uniforms[] = {
@@ -996,7 +996,7 @@ FragmentShaderRGBATexAlphaMask::FragmentShaderRGBATexAlphaMask()
       alpha_location_(-1),
       mask_tex_coord_scale_location_(-1) {}
 
-void FragmentShaderRGBATexAlphaMask::Init(WebGraphicsContext3D* context,
+void FragmentShaderRGBATexAlphaMask::Init(GLES2Interface* context,
                                           unsigned program,
                                           int* base_uniform_index) {
   static const char* uniforms[] = {
@@ -1049,7 +1049,7 @@ FragmentShaderRGBATexAlphaMaskAA::FragmentShaderRGBATexAlphaMaskAA()
       mask_tex_coord_scale_location_(-1),
       mask_tex_coord_offset_location_(-1) {}
 
-void FragmentShaderRGBATexAlphaMaskAA::Init(WebGraphicsContext3D* context,
+void FragmentShaderRGBATexAlphaMaskAA::Init(GLES2Interface* context,
                                             unsigned program,
                                             int* base_uniform_index) {
   static const char* uniforms[] = {
@@ -1110,7 +1110,7 @@ FragmentShaderRGBATexAlphaMaskColorMatrixAA::
           color_offset_location_(-1) {}
 
 void FragmentShaderRGBATexAlphaMaskColorMatrixAA::Init(
-    WebGraphicsContext3D* context,
+    GLES2Interface* context,
     unsigned program,
     int* base_uniform_index) {
   static const char* uniforms[] = {
@@ -1180,7 +1180,7 @@ FragmentShaderRGBATexAlphaColorMatrixAA::
           color_offset_location_(-1) {}
 
 void FragmentShaderRGBATexAlphaColorMatrixAA::Init(
-      WebGraphicsContext3D* context,
+      GLES2Interface* context,
       unsigned program,
       int* base_uniform_index) {
   static const char* uniforms[] = {
@@ -1237,7 +1237,7 @@ FragmentShaderRGBATexAlphaMaskColorMatrix::
           mask_tex_coord_scale_location_(-1) {}
 
 void FragmentShaderRGBATexAlphaMaskColorMatrix::Init(
-    WebGraphicsContext3D* context,
+    GLES2Interface* context,
     unsigned program,
     int* base_uniform_index) {
   static const char* uniforms[] = {
@@ -1302,7 +1302,7 @@ FragmentShaderYUVVideo::FragmentShaderYUVVideo()
       yuv_matrix_location_(-1),
       yuv_adj_location_(-1) {}
 
-void FragmentShaderYUVVideo::Init(WebGraphicsContext3D* context,
+void FragmentShaderYUVVideo::Init(GLES2Interface* context,
                                   unsigned program,
                                   int* base_uniform_index) {
   static const char* uniforms[] = {
@@ -1362,7 +1362,7 @@ FragmentShaderYUVAVideo::FragmentShaderYUVAVideo()
       yuv_adj_location_(-1) {
 }
 
-void FragmentShaderYUVAVideo::Init(WebGraphicsContext3D* context,
+void FragmentShaderYUVAVideo::Init(GLES2Interface* context,
                                    unsigned program,
                                    int* base_uniform_index) {
   static const char* uniforms[] = {
@@ -1419,7 +1419,7 @@ std::string FragmentShaderYUVAVideo::GetShaderString(
 FragmentShaderColor::FragmentShaderColor()
     : color_location_(-1) {}
 
-void FragmentShaderColor::Init(WebGraphicsContext3D* context,
+void FragmentShaderColor::Init(GLES2Interface* context,
                                unsigned program,
                                int* base_uniform_index) {
   static const char* uniforms[] = {
@@ -1450,7 +1450,7 @@ std::string FragmentShaderColor::GetShaderString(
 FragmentShaderColorAA::FragmentShaderColorAA()
     : color_location_(-1) {}
 
-void FragmentShaderColorAA::Init(WebGraphicsContext3D* context,
+void FragmentShaderColorAA::Init(GLES2Interface* context,
                                  unsigned program,
                                  int* base_uniform_index) {
   static const char* uniforms[] = {
@@ -1488,7 +1488,7 @@ FragmentShaderCheckerboard::FragmentShaderCheckerboard()
       tex_transform_location_(-1),
       frequency_location_(-1) {}
 
-void FragmentShaderCheckerboard::Init(WebGraphicsContext3D* context,
+void FragmentShaderCheckerboard::Init(GLES2Interface* context,
                                       unsigned program,
                                       int* base_uniform_index) {
   static const char* uniforms[] = {
diff --git a/cc/output/shader.h b/cc/output/shader.h
index 986e6d9..9473ce8 100644
--- a/cc/output/shader.h
+++ b/cc/output/shader.h
@@ -16,7 +16,11 @@ class Point;
 class Size;
 }
 
-namespace blink { class WebGraphicsContext3D; }
+namespace gpu {
+namespace gles2 {
+class GLES2Interface;
+}
+}
 
 namespace cc {
 
@@ -40,13 +44,13 @@ enum SamplerType {
 // The caller must make sure to clear highp_threshold_cache to 0, so it can be
 // reinitialized, if a new or different context is used.
 CC_EXPORT TexCoordPrecision TexCoordPrecisionRequired(
-    blink::WebGraphicsContext3D* context,
+    gpu::gles2::GLES2Interface* context,
     int *highp_threshold_cache,
     int highp_threshold_min,
     gfx::Point max_coordinate);
 
 CC_EXPORT TexCoordPrecision TexCoordPrecisionRequired(
-    blink::WebGraphicsContext3D* context,
+    gpu::gles2::GLES2Interface* context,
     int *highp_threshold_cache,
     int highp_threshold_min,
     gfx::Size max_size);
@@ -55,7 +59,7 @@ class VertexShaderPosTex {
  public:
   VertexShaderPosTex();
 
-  void Init(blink::WebGraphicsContext3D* context,
+  void Init(gpu::gles2::GLES2Interface* context,
             unsigned program,
             int* base_uniform_index);
   std::string GetShaderString() const;
@@ -72,7 +76,7 @@ class VertexShaderPosTexYUVStretch {
  public:
   VertexShaderPosTexYUVStretch();
 
-  void Init(blink::WebGraphicsContext3D* context,
+  void Init(gpu::gles2::GLES2Interface* context,
             unsigned program,
             int* base_uniform_index);
   std::string GetShaderString() const;
@@ -91,7 +95,7 @@ class VertexShaderPos {
  public:
   VertexShaderPos();
 
-  void Init(blink::WebGraphicsContext3D* context,
+  void Init(gpu::gles2::GLES2Interface* context,
             unsigned program,
             int* base_uniform_index);
   std::string GetShaderString() const;
@@ -106,7 +110,7 @@ class VertexShaderPos {
 
 class VertexShaderPosTexIdentity {
  public:
-  void Init(blink::WebGraphicsContext3D* context,
+  void Init(gpu::gles2::GLES2Interface* context,
             unsigned program,
             int* base_uniform_index) {}
   std::string GetShaderString() const;
@@ -116,7 +120,7 @@ class VertexShaderPosTexTransform {
  public:
   VertexShaderPosTexTransform();
 
-  void Init(blink::WebGraphicsContext3D* context,
+  void Init(gpu::gles2::GLES2Interface* context,
             unsigned program,
             int* base_uniform_index);
   std::string GetShaderString() const;
@@ -137,7 +141,7 @@ class VertexShaderQuad {
  public:
   VertexShaderQuad();
 
-  void Init(blink::WebGraphicsContext3D* context,
+  void Init(gpu::gles2::GLES2Interface* context,
            unsigned program,
            int* base_uniform_index);
   std::string GetShaderString() const;
@@ -158,7 +162,7 @@ class VertexShaderQuadAA {
  public:
   VertexShaderQuadAA();
 
-  void Init(blink::WebGraphicsContext3D* context,
+  void Init(gpu::gles2::GLES2Interface* context,
            unsigned program,
            int* base_uniform_index);
   std::string GetShaderString() const;
@@ -182,7 +186,7 @@ class VertexShaderQuadTexTransformAA {
  public:
   VertexShaderQuadTexTransformAA();
 
-  void Init(blink::WebGraphicsContext3D* context,
+  void Init(gpu::gles2::GLES2Interface* context,
            unsigned program,
            int* base_uniform_index);
   std::string GetShaderString() const;
@@ -207,7 +211,7 @@ class VertexShaderTile {
  public:
   VertexShaderTile();
 
-  void Init(blink::WebGraphicsContext3D* context,
+  void Init(gpu::gles2::GLES2Interface* context,
             unsigned program,
             int* base_uniform_index);
   std::string GetShaderString() const;
@@ -232,7 +236,7 @@ class VertexShaderTileAA {
  public:
   VertexShaderTileAA();
 
-  void Init(blink::WebGraphicsContext3D* context,
+  void Init(gpu::gles2::GLES2Interface* context,
             unsigned program,
             int* base_uniform_index);
   std::string GetShaderString() const;
@@ -259,7 +263,7 @@ class VertexShaderVideoTransform {
  public:
   VertexShaderVideoTransform();
 
-  void Init(blink::WebGraphicsContext3D* context,
+  void Init(gpu::gles2::GLES2Interface* context,
             unsigned program,
             int* base_uniform_index);
   std::string GetShaderString() const;
@@ -278,7 +282,7 @@ class FragmentTexAlphaBinding {
  public:
   FragmentTexAlphaBinding();
 
-  void Init(blink::WebGraphicsContext3D* context,
+  void Init(gpu::gles2::GLES2Interface* context,
             unsigned program,
             int* base_uniform_index);
   int alpha_location() const { return alpha_location_; }
@@ -296,7 +300,7 @@ class FragmentTexColorMatrixAlphaBinding {
  public:
     FragmentTexColorMatrixAlphaBinding();
 
-    void Init(blink::WebGraphicsContext3D* context,
+    void Init(gpu::gles2::GLES2Interface* context,
               unsigned program,
               int* base_uniform_index);
     int alpha_location() const { return alpha_location_; }
@@ -316,7 +320,7 @@ class FragmentTexOpaqueBinding {
  public:
   FragmentTexOpaqueBinding();
 
-  void Init(blink::WebGraphicsContext3D* context,
+  void Init(gpu::gles2::GLES2Interface* context,
             unsigned program,
             int* base_uniform_index);
   int alpha_location() const { return -1; }
@@ -334,7 +338,7 @@ class FragmentTexBackgroundBinding {
  public:
   FragmentTexBackgroundBinding();
 
-  void Init(blink::WebGraphicsContext3D* context,
+  void Init(gpu::gles2::GLES2Interface* context,
             unsigned program,
             int* base_uniform_index);
   int background_color_location() const { return background_color_location_; }
@@ -416,7 +420,7 @@ class FragmentShaderRGBATexAlphaAA {
  public:
   FragmentShaderRGBATexAlphaAA();
 
-  void Init(blink::WebGraphicsContext3D* context,
+  void Init(gpu::gles2::GLES2Interface* context,
             unsigned program,
             int* base_uniform_index);
   std::string GetShaderString(
@@ -436,7 +440,7 @@ class FragmentTexClampAlphaAABinding {
  public:
   FragmentTexClampAlphaAABinding();
 
-  void Init(blink::WebGraphicsContext3D* context,
+  void Init(gpu::gles2::GLES2Interface* context,
             unsigned program,
             int* base_uniform_index);
   int alpha_location() const { return alpha_location_; }
@@ -474,7 +478,7 @@ class FragmentShaderRGBATexAlphaMask {
   std::string GetShaderString(
       TexCoordPrecision precision, SamplerType sampler) const;
 
-  void Init(blink::WebGraphicsContext3D* context,
+  void Init(gpu::gles2::GLES2Interface* context,
             unsigned program,
             int* base_uniform_index);
   int alpha_location() const { return alpha_location_; }
@@ -503,7 +507,7 @@ class FragmentShaderRGBATexAlphaMaskAA {
   std::string GetShaderString(
       TexCoordPrecision precision, SamplerType sampler) const;
 
-  void Init(blink::WebGraphicsContext3D* context,
+  void Init(gpu::gles2::GLES2Interface* context,
             unsigned program,
             int* base_uniform_index);
   int alpha_location() const { return alpha_location_; }
@@ -532,7 +536,7 @@ class FragmentShaderRGBATexAlphaMaskColorMatrixAA {
   std::string GetShaderString(
       TexCoordPrecision precision, SamplerType sampler) const;
 
-  void Init(blink::WebGraphicsContext3D* context,
+  void Init(gpu::gles2::GLES2Interface* context,
             unsigned program,
             int* base_uniform_index);
   int alpha_location() const { return alpha_location_; }
@@ -563,7 +567,7 @@ class FragmentShaderRGBATexAlphaColorMatrixAA {
   std::string GetShaderString(
       TexCoordPrecision precision, SamplerType sampler) const;
 
-  void Init(blink::WebGraphicsContext3D* context,
+  void Init(gpu::gles2::GLES2Interface* context,
             unsigned program,
             int* base_uniform_index);
   int alpha_location() const { return alpha_location_; }
@@ -584,7 +588,7 @@ class FragmentShaderRGBATexAlphaMaskColorMatrix {
   std::string GetShaderString(
       TexCoordPrecision precision, SamplerType sampler) const;
 
-  void Init(blink::WebGraphicsContext3D* context,
+  void Init(gpu::gles2::GLES2Interface* context,
             unsigned program,
             int* base_uniform_index);
   int alpha_location() const { return alpha_location_; }
@@ -615,7 +619,7 @@ class FragmentShaderYUVVideo {
   std::string GetShaderString(
       TexCoordPrecision precision, SamplerType sampler) const;
 
-  void Init(blink::WebGraphicsContext3D* context,
+  void Init(gpu::gles2::GLES2Interface* context,
             unsigned program,
             int* base_uniform_index);
   int y_texture_location() const { return y_texture_location_; }
@@ -643,7 +647,7 @@ class FragmentShaderYUVAVideo {
   std::string GetShaderString(
       TexCoordPrecision precision, SamplerType sampler) const;
 
-  void Init(blink::WebGraphicsContext3D* context,
+  void Init(gpu::gles2::GLES2Interface* context,
             unsigned program,
             int* base_uniform_index);
 
@@ -673,7 +677,7 @@ class FragmentShaderColor {
   std::string GetShaderString(
       TexCoordPrecision precision, SamplerType sampler) const;
 
-  void Init(blink::WebGraphicsContext3D* context,
+  void Init(gpu::gles2::GLES2Interface* context,
             unsigned program,
             int* base_uniform_index);
   int color_location() const { return color_location_; }
@@ -690,7 +694,7 @@ class FragmentShaderColorAA {
   std::string GetShaderString(
       TexCoordPrecision precision, SamplerType sampler) const;
 
-  void Init(blink::WebGraphicsContext3D* context,
+  void Init(gpu::gles2::GLES2Interface* context,
             unsigned program,
             int* base_uniform_index);
   int color_location() const { return color_location_; }
@@ -707,7 +711,7 @@ class FragmentShaderCheckerboard {
   std::string GetShaderString(
       TexCoordPrecision precision, SamplerType sampler) const;
 
-  void Init(blink::WebGraphicsContext3D* context,
+  void Init(gpu::gles2::GLES2Interface* context,
             unsigned program,
             int* base_uniform_index);
   int alpha_location() const { return alpha_location_; }
diff --git a/cc/output/shader_unittest.cc b/cc/output/shader_unittest.cc
index a608d93..4aacbf7 100644
--- a/cc/output/shader_unittest.cc
+++ b/cc/output/shader_unittest.cc
@@ -4,7 +4,8 @@
 
 #include "cc/output/shader.h"
 
-#include "cc/test/fake_web_graphics_context_3d.h"
+#include "cc/test/test_gles2_interface.h"
+#include "cc/test/test_web_graphics_context_3d.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/point.h"
 #include "ui/gfx/size.h"
@@ -12,9 +13,11 @@
 namespace cc {
 
 TEST(ShaderTest, HighpThresholds) {
-  // The FakeWebGraphicsContext3D always uses a mediump precision of 10 bits
-  // which corresponds to a native highp threshold of 2^10 = 1024
-  FakeWebGraphicsContext3D context;
+  // The test context always uses a mediump precision of 10 bits which
+  // corresponds to a native highp threshold of 2^10 = 1024
+  scoped_ptr<TestWebGraphicsContext3D> stub_context =
+    TestWebGraphicsContext3D::Create();
+  TestGLES2Interface stub_gl(stub_context.get());
 
   int threshold_cache = 0;
   int threshold_min;
@@ -25,23 +28,23 @@ TEST(ShaderTest, HighpThresholds) {
 
   threshold_min = 0;
   EXPECT_EQ(TexCoordPrecisionMedium, TexCoordPrecisionRequired(
-      &context, &threshold_cache, threshold_min, closePoint));
+      &stub_gl, &threshold_cache, threshold_min, closePoint));
   EXPECT_EQ(TexCoordPrecisionMedium, TexCoordPrecisionRequired(
-      &context, &threshold_cache, threshold_min, smallSize));
+      &stub_gl, &threshold_cache, threshold_min, smallSize));
   EXPECT_EQ(TexCoordPrecisionHigh, TexCoordPrecisionRequired(
-      &context, &threshold_cache, threshold_min, farPoint));
+      &stub_gl, &threshold_cache, threshold_min, farPoint));
   EXPECT_EQ(TexCoordPrecisionHigh, TexCoordPrecisionRequired(
-      &context, &threshold_cache, threshold_min, bigSize));
+      &stub_gl, &threshold_cache, threshold_min, bigSize));
 
   threshold_min = 3000;
   EXPECT_EQ(TexCoordPrecisionMedium, TexCoordPrecisionRequired(
-      &context, &threshold_cache, threshold_min, closePoint));
+      &stub_gl, &threshold_cache, threshold_min, closePoint));
   EXPECT_EQ(TexCoordPrecisionMedium, TexCoordPrecisionRequired(
-      &context, &threshold_cache, threshold_min, smallSize));
+      &stub_gl, &threshold_cache, threshold_min, smallSize));
   EXPECT_EQ(TexCoordPrecisionMedium, TexCoordPrecisionRequired(
-      &context, &threshold_cache, threshold_min, farPoint));
+      &stub_gl, &threshold_cache, threshold_min, farPoint));
   EXPECT_EQ(TexCoordPrecisionMedium, TexCoordPrecisionRequired(
-      &context, &threshold_cache, threshold_min, bigSize));
+      &stub_gl, &threshold_cache, threshold_min, bigSize));
 }
 
 }  // namespace cc