gpu: Add flag for enabling asynchronous worker context.

content/test/fake_compositor_dependencies.cc

 // 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.
 
 #include "content/test/fake_compositor_dependencies.h"
 
 #include <stddef.h>
 
 #include "base/memory/ptr_util.h"
 #include "base/single_thread_task_runner.h"
@@ skipping 11 matching lines @@
 }
 
 bool FakeCompositorDependencies::IsGpuRasterizationForced() {
   return false;
 }
 
 bool FakeCompositorDependencies::IsGpuRasterizationEnabled() {
   return false;
 }
 
+bool FakeCompositorDependencies::IsAsyncWorkerContextEnabled() {
+  return false;
+}
+
 int FakeCompositorDependencies::GetGpuRasterizationMSAASampleCount() {
   return 0;
 }
 
 bool FakeCompositorDependencies::IsLcdTextEnabled() {
   return false;
 }
 
 bool FakeCompositorDependencies::IsDistanceFieldTextEnabled() {
   return false;
@@ skipping 60 matching lines @@
 
 bool FakeCompositorDependencies::AreImageDecodeTasksEnabled() {
   return false;
 }
 
 bool FakeCompositorDependencies::IsThreadedAnimationEnabled() {
   return true;
 }
 
 }  // namespace content