Add FrameGenerator Unit Tests

cc/test/test_compositor_frame_sink.h

 // Copyright 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.
 
 #ifndef CC_TEST_TEST_COMPOSITOR_FRAME_SINK_H_
 #define CC_TEST_TEST_COMPOSITOR_FRAME_SINK_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "cc/output/compositor_frame_sink.h"
@@ skipping 76 matching lines @@
   void ReclaimResources(const ReturnedResourceArray& resources) override;
   void WillDrawSurface(const LocalSurfaceId& local_surface_id,
                        const gfx::Rect& damage_rect) override;
 
   // DisplayClient implementation.
   void DisplayOutputSurfaceLost() override;
   void DisplayWillDrawAndSwap(bool will_draw_and_swap,
                               const RenderPassList& render_passes) override;
   void DisplayDidDrawAndSwap() override;
 
+  int numder_of_frames_submitted() { return numder_of_frames_submitted_; }
+
  private:
   // ExternalBeginFrameSource implementation.
   void OnNeedsBeginFrames(bool needs_begin_frames) override;
   void OnDidFinishFrame(const BeginFrameAck& ack) override;
 
   void SendCompositorFrameAckToClient();
 
   const bool synchronous_composite_;
   const RendererSettings renderer_settings_;
 
@@ skipping 19 matching lines @@
   gfx::Size enlarge_pass_texture_amount_;
 
   std::vector<std::unique_ptr<CopyOutputRequest>> copy_requests_;
 
   base::WeakPtrFactory<TestCompositorFrameSink> weak_ptr_factory_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_TEST_COMPOSITOR_FRAME_SINK_H_