cc: Make SingleThreadProxy ignore commit requests inside Layout().

content/renderer/gpu/render_widget_compositor_unittest.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/renderer/gpu/render_widget_compositor.h"
 
 #include "cc/output/begin_frame_args.h"
 #include "cc/test/failure_output_surface.h"
 #include "cc/trees/layer_tree_host.h"
 #include "components/scheduler/renderer/renderer_scheduler.h"
@@ skipping 39 matching lines @@
  public:
   RenderWidgetCompositorTest()
       : render_widget_(make_scoped_refptr(new TestRenderWidget())),
         compositor_deps_(make_scoped_ptr(new FakeCompositorDependencies)),
         render_widget_compositor_(
             RenderWidgetCompositor::Create(render_widget_.get(),
                                            compositor_deps_.get())) {}
   ~RenderWidgetCompositorTest() override {}
 
  protected:
+  base::MessageLoop loop_;
   MockRenderThread render_thread_;
   scoped_refptr<TestRenderWidget> render_widget_;
   scoped_ptr<FakeCompositorDependencies> compositor_deps_;
   scoped_ptr<RenderWidgetCompositor> render_widget_compositor_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetCompositorTest);
 };
 
 TEST_F(RenderWidgetCompositorTest, BeginMainFrame) {
@@ skipping 239 matching lines @@
 }
 
 TEST_F(RenderWidgetCompositorOutputSurfaceTest, FallbackSuccessNormalSuccess) {
   // The first success is a fallback, but the next should not be a fallback.
   RunTest(false, RenderWidgetCompositor::OUTPUT_SURFACE_RETRIES_BEFORE_FALLBACK,
           1, 1);
 }
 
 }  // namespace
 }  // namespace content