media::SilentSinkSuspender should simulate |delay| and |delay_timestamp|

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 <stdint.h>
 
 #include "base/macros.h"
@@ skipping 26 matching lines @@
 
   // AudioTransform::ProvideAudioTransformInput implementation.
   double ProvideInput(AudioBus* audio_bus, uint32_t frames_delayed) 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.
   void reset() { x_ = 0; }
 
-  // Returns the last |frames_delayed| provided to Render() or -1 if
-  // no Render() call occurred.
-  int last_frames_delayed() const { return last_frames_delayed_; }
+  // Returns the last |delay| provided to Render() or base::TimeDelta::Max()
+  // if no Render() call occurred.
+  base::TimeDelta last_delay() const { return last_delay_; }
 
   // Set volume information used by ProvideAudioTransformInput().
   void set_volume(double volume) { volume_ = volume; }
 
   int last_channel_count() const { return last_channel_count_; }
 
  private:
-  int RenderInternal(AudioBus* audio_bus,
-                     uint32_t frames_delayed,
-                     double volume);
+  int RenderInternal(AudioBus* audio_bus, base::TimeDelta delay, double volume);
 
   bool half_fill_;
   double x_;
   double step_;
-  int last_frames_delayed_;
+  base::TimeDelta last_delay_;
   int last_channel_count_;
   double volume_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeAudioRenderCallback);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_FAKE_AUDIO_RENDER_CALLBACK_H_