Migrate WebGL contexts on backgrounded tabs to the integrated GPU.

gpu/command_buffer/service/gles2_cmd_validation_implementation_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 637 matching lines @@
     case GL_TRANSLATE_3D_CHROMIUM:
     case GL_AFFINE_2D_CHROMIUM:
     case GL_AFFINE_3D_CHROMIUM:
     case GL_TRANSPOSE_AFFINE_2D_CHROMIUM:
     case GL_TRANSPOSE_AFFINE_3D_CHROMIUM:
       return true;
   }
   return false;
 };
 
+bool Validators::PerformanceHintModeValidator::IsValid(
+    const GLenum value) const {
+  switch (value) {
+    case GL_DEFAULT_POWER_CHROMIUM:
+    case GL_LOW_POWER_CHROMIUM:
+    case GL_HIGH_PERFORMANCE_CHROMIUM:
+      return true;
+  }
+  return false;
+};
+
 static const GLenum valid_pixel_store_table[] = {
     GL_PACK_ALIGNMENT, GL_UNPACK_ALIGNMENT,
 };
 
 static const GLenum valid_pixel_store_table_es3[] = {
     GL_PACK_ROW_LENGTH,   GL_PACK_SKIP_PIXELS,    GL_PACK_SKIP_ROWS,
     GL_UNPACK_ROW_LENGTH, GL_UNPACK_IMAGE_HEIGHT, GL_UNPACK_SKIP_PIXELS,
     GL_UNPACK_SKIP_ROWS,  GL_UNPACK_SKIP_IMAGES,
 };
 
@@ skipping 867 matching lines @@
   texture_internal_format_storage.AddValue(GL_COMPRESSED_SRGB8_ETC2);
   texture_internal_format_storage.AddValue(
       GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2);
   texture_internal_format_storage.AddValue(
       GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2);
   texture_internal_format_storage.AddValue(GL_COMPRESSED_RGBA8_ETC2_EAC);
   texture_internal_format_storage.AddValue(GL_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC);
 }
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_GLES2_CMD_VALIDATION_IMPLEMENTATION_AUTOGEN_H_