Migrate WebGL contexts on backgrounded tabs to the integrated GPU.

gpu/command_buffer/client/gles2_c_lib_autogen.h

 // Copyright 2014 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 auto-generated from
 // gpu/command_buffer/build_gles2_cmd_buffer.py
 // It's formatted by clang-format using chromium coding style:
 //    clang-format -i -style=chromium filename
 // DO NOT EDIT!
 
@@ skipping 1709 matching lines @@
                                                    GLint display_y) {
   gles2::GetGLContext()->OverlayPromotionHintCHROMIUM(texture, promotion_hint,
                                                       display_x, display_y);
 }
 void GL_APIENTRY GLES2SwapBuffersWithDamageCHROMIUM(GLint x,
                                                     GLint y,
                                                     GLint width,
                                                     GLint height) {
   gles2::GetGLContext()->SwapBuffersWithDamageCHROMIUM(x, y, width, height);
 }
+void GL_APIENTRY GLES2PerformanceHintCHROMIUM(GLenum mode) {
+  gles2::GetGLContext()->PerformanceHintCHROMIUM(mode);
+}
 
 namespace gles2 {
 
 extern const NameToFunc g_gles2_function_table[] = {
     {
         "glActiveTexture",
         reinterpret_cast<GLES2FunctionPointer>(glActiveTexture),
     },
     {
         "glAttachShader",
@@ skipping 1288 matching lines @@
     },
     {
         "glOverlayPromotionHintCHROMIUM",
         reinterpret_cast<GLES2FunctionPointer>(glOverlayPromotionHintCHROMIUM),
     },
     {
         "glSwapBuffersWithDamageCHROMIUM",
         reinterpret_cast<GLES2FunctionPointer>(glSwapBuffersWithDamageCHROMIUM),
     },
     {
+        "glPerformanceHintCHROMIUM",
+        reinterpret_cast<GLES2FunctionPointer>(glPerformanceHintCHROMIUM),
+    },
+    {
         NULL, NULL,
     },
 };
 
 }  // namespace gles2
 #endif  // GPU_COMMAND_BUFFER_CLIENT_GLES2_C_LIB_AUTOGEN_H_