Forward the number of skipped frames by the OS in audio playout.

media/base/fake_audio_render_callback.h

 // Copyright (c) 2012 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_BASE_FAKE_AUDIO_RENDER_CALLBACK_H_
 #define MEDIA_BASE_FAKE_AUDIO_RENDER_CALLBACK_H_
 
 #include "media/base/audio_converter.h"
 #include "media/base/audio_renderer_sink.h"
 #include "testing/gmock/include/gmock/gmock.h"
 
 namespace media {
 
 // Fake RenderCallback which will fill each request with a sine wave.  Sine
 // state is kept across callbacks.  State can be reset to default via reset().
 // Also provide an interface to AudioTransformInput.
 class FakeAudioRenderCallback
     : public AudioRendererSink::RenderCallback,
       public AudioConverter::InputCallback {
  public:
   // The function used to fulfill Render() is f(x) = sin(2 * PI * x * |step|),
   // where x = [|number_of_frames| * m, |number_of_frames| * (m + 1)] and m =
   // the number of Render() calls fulfilled thus far.
   explicit FakeAudioRenderCallback(double step);
   ~FakeAudioRenderCallback() override;
 
   // Renders a sine wave into the provided audio data buffer.  If |half_fill_|
   // is set, will only fill half the buffer.
-  int Render(AudioBus* audio_bus, int audio_delay_milliseconds) override;
+  int Render(AudioBus* audio_bus,
+             int audio_delay_milliseconds,
+             uint32_t frames_skipped) override;
   MOCK_METHOD0(OnRenderError, void());
 
   // AudioTransform::ProvideAudioTransformInput implementation.
   double ProvideInput(AudioBus* audio_bus,
                       base::TimeDelta buffer_delay) override;
 
   // Toggles only filling half the requested amount during Render().
   void set_half_fill(bool half_fill) { half_fill_ = half_fill; }
 
   // Reset the sine state to initial value.
@@ skipping 17 matching lines @@
   int last_audio_delay_milliseconds_;
   int last_channel_count_;
   double volume_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeAudioRenderCallback);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_FAKE_AUDIO_RENDER_CALLBACK_H_