Migrate WebGL contexts on backgrounded tabs to the integrated GPU.

gpu/command_buffer/service/gles2_cmd_decoder.cc

 // Copyright (c) 2012 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/gles2_cmd_decoder.h"
 
 #include <limits.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <stdio.h>
@@ skipping 1847 matching lines @@
   // Wrapper for glUseProgram
   void DoUseProgram(GLuint program);
 
   // Wrapper for glValidateProgram.
   void DoValidateProgram(GLuint program_client_id);
 
   void DoInsertEventMarkerEXT(GLsizei length, const GLchar* marker);
   void DoPushGroupMarkerEXT(GLsizei length, const GLchar* group);
   void DoPopGroupMarkerEXT(void);
 
+  // Wrapper for PerformanceHintCHROMIUM.
+  void DoPerformanceHintCHROMIUM(GLenum mode);
+
   // Gets the number of values that will be returned by glGetXXX. Returns
   // false if pname is unknown.
   bool GetNumValuesReturnedForGLGet(GLenum pname, GLsizei* num_values);
 
   // Checks if every attribute's type set by vertexAttrib API match
   // the type of corresponding attribute in vertex shader.
   bool AttribsTypeMatch();
 
   // Checks if the current program and vertex attributes are valid for drawing.
   bool IsDrawValid(
@@ skipping 17247 matching lines @@
       glBindTexture(GL_TEXTURE_EXTERNAL_OES, texture_ref->service_id());
     }
   }
 
   glActiveTexture(GL_TEXTURE0 + state_.active_texture_unit);
 
   texture_manager_service_id_generation_ =
       texture_manager()->GetServiceIdGeneration();
 }
 
+void GLES2DecoderImpl::DoPerformanceHintCHROMIUM(GLenum mode) {
+  switch (mode) {
+    case GL_LOW_POWER_CHROMIUM:
+      context_->SetPerformancePreference(gl::PreferLowPower);
+      break;
+    case GL_DEFAULT_POWER_CHROMIUM:
+      context_->SetPerformancePreference(gl::PreferDefaultPerformance);
+      break;
+    case GL_HIGH_PERFORMANCE_CHROMIUM:
+      context_->SetPerformancePreference(gl::PreferHighPerformance);
+      break;
+  }
+}
+
 // Include the auto-generated part of this file. We split this because it means
 // we can easily edit the non-auto generated parts right here in this file
 // instead of having to edit some template or the code generator.
 #include "base/macros.h"
 #include "gpu/command_buffer/service/gles2_cmd_decoder_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu