Migrate WebGL contexts on backgrounded tabs to the integrated GPU.

gpu/command_buffer/service/gles2_cmd_decoder_passthrough_doers.cc

 // Copyright (c) 2016 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_passthrough.h"
 
 #include "base/strings/string_number_conversions.h"
 
 namespace gpu {
 namespace gles2 {
@@ skipping 3304 matching lines @@
 
 error::Error GLES2DecoderPassthroughImpl::DoOverlayPromotionHintCHROMIUM(
     GLuint texture,
     GLboolean promotion_hint,
     GLint display_x,
     GLint display_y) {
   NOTIMPLEMENTED();
   return error::kNoError;
 }
 
+error::Error GLES2DecoderPassthroughImpl::DoPerformanceHintCHROMIUM(
+    GLenum mode) {
+  NOTIMPLEMENTED();
+  return error::kNoError;
+}
+
 }  // namespace gles2
 }  // namespace gpu