Fix underflow correction occurring during normal rendering.

media/renderers/video_renderer_impl.h

 // Copyright 2013 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 MEDIA_RENDERERS_VIDEO_RENDERER_IMPL_H_
 #define MEDIA_RENDERERS_VIDEO_RENDERER_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 61 matching lines @@
   void StartPlayingFrom(base::TimeDelta timestamp) override;
   void OnTimeProgressing() override;
   void OnTimeStopped() override;
 
   void SetTickClockForTesting(std::unique_ptr<base::TickClock> tick_clock);
   void SetGpuMemoryBufferVideoForTesting(
       std::unique_ptr<GpuMemoryBufferVideoFramePool> gpu_memory_buffer_pool);
   size_t frames_queued_for_testing() const {
     return algorithm_->frames_queued();
   }
+  size_t effective_frames_queued_for_testing() const {
+    return algorithm_->effective_frames_queued();
+  }
 
   // VideoRendererSink::RenderCallback implementation.
   scoped_refptr<VideoFrame> Render(base::TimeTicks deadline_min,
                                    base::TimeTicks deadline_max,
                                    bool background_rendering) override;
   void OnFrameDropped() override;
 
  private:
   // Callback for |video_frame_stream_| initialization.
   void OnVideoFrameStreamInitialized(bool success);
@@ skipping 205 matching lines @@
   // want to discard video frames that might be received after the stream has
   // been reset.
   base::WeakPtrFactory<VideoRendererImpl> frame_callback_weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoRendererImpl);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_RENDERERS_VIDEO_RENDERER_IMPL_H_