Introduce CompositorDependencies for RenderWidgetCompositor.

content/test/fake_renderer_scheduler.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.
 
-#ifndef CONTENT_RENDERER_SCHEDULER_NULL_RENDERER_SCHEDULER_H_
-#define CONTENT_RENDERER_SCHEDULER_NULL_RENDERER_SCHEDULER_H_
+#ifndef CONTENT_TEST_FAKE_RENDERER_SCHEDULER_H_
+#define CONTENT_TEST_FAKE_RENDERER_SCHEDULER_H_
 
 #include "content/renderer/scheduler/renderer_scheduler.h"
 
 namespace content {
 
-class NullRendererScheduler : public RendererScheduler {
+class FakeRendererScheduler : public RendererScheduler {
  public:
-  NullRendererScheduler();
-  ~NullRendererScheduler() override;
+  FakeRendererScheduler();
+  virtual ~FakeRendererScheduler();
 
+  // RendererScheduler implementation.
   scoped_refptr<base::SingleThreadTaskRunner> DefaultTaskRunner() override;
   scoped_refptr<base::SingleThreadTaskRunner> CompositorTaskRunner() override;
   scoped_refptr<SingleThreadIdleTaskRunner> IdleTaskRunner() override;
-
   void WillBeginFrame(const cc::BeginFrameArgs& args) override;
   void DidCommitFrameToCompositor() override;
   void DidReceiveInputEventOnCompositorThread(
       blink::WebInputEvent::Type type) override;
   void DidAnimateForInputOnCompositorThread() override;
   bool ShouldYieldForHighPriorityWork() override;
   void Shutdown() override;
 
  private:
-  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
-  scoped_refptr<SingleThreadIdleTaskRunner> idle_task_runner_;
-
-  DISALLOW_COPY_AND_ASSIGN(NullRendererScheduler);
+  DISALLOW_COPY_AND_ASSIGN(FakeRendererScheduler);
 };
 
 }  // namespace content
 
-#endif  // CONTENT_RENDERER_SCHEDULER_NULL_RENDERER_SCHEDULER_H_
+#endif  // CONTENT_TEST_FAKE_RENDERER_SCHEDULER_H_