Migrate WebGL contexts on backgrounded tabs to the integrated GPU.

ui/gl/gl_bindings.h

 // 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.
 
 #ifndef UI_GL_GL_BINDINGS_H_
 #define UI_GL_GL_BINDINGS_H_
 
 // Includes the platform independent and platform dependent GL headers.
 // Only include this in cc files. It pulls in system headers, including
 // the X11 headers on linux, which define all kinds of macros that are
@@ skipping 337 matching lines @@
 #ifndef GL_EXT_blend_func_extended
 #define GL_EXT_blend_func_extended 1
 #define GL_SRC_ALPHA_SATURATE_EXT 0x0308
 #define GL_SRC1_ALPHA_EXT 0x8589  // OpenGL 1.5 token value
 #define GL_SRC1_COLOR_EXT 0x88F9
 #define GL_ONE_MINUS_SRC1_COLOR_EXT 0x88FA
 #define GL_ONE_MINUS_SRC1_ALPHA_EXT 0x88FB
 #define GL_MAX_DUAL_SOURCE_DRAW_BUFFERS_EXT 0x88FC
 #endif /* GL_EXT_blend_func_extended */
 
+#ifndef GL_DEFAULT_POWER_CHROMIUM
+#define GL_DEFAULT_POWER_CHROMIUM 0x924B
+#endif
+#ifndef GL_LOW_POWER_CHROMIUM
+#define GL_LOW_POWER_CHROMIUM 0x924C
+#endif
+#ifndef GL_HIGH_PERFORMANCE_CHROMIUM
+#define GL_HIGH_PERFORMANCE_CHROMIUM 0x924D
+#endif
+
 #define GL_GLEXT_PROTOTYPES 1
 
 #if defined(OS_WIN)
 #define GL_BINDING_CALL WINAPI
 #else
 #define GL_BINDING_CALL
 #endif
 
 #define GL_SERVICE_LOG(args) DLOG(INFO) << args;
 #if defined(NDEBUG)
@@ skipping 128 matching lines @@
 #endif
 
 #if defined(USE_GLX)
 GL_EXPORT extern GLXApi* g_current_glx_context;
 GL_EXPORT extern DriverGLX g_driver_glx;
 #endif
 
 }  // namespace gl
 
 #endif  // UI_GL_GL_BINDINGS_H_