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

media/base/fake_audio_render_callback.h

Index: media/base/fake_audio_render_callback.h
diff --git a/media/base/fake_audio_render_callback.h b/media/base/fake_audio_render_callback.h
index 5e2a600bfab099d8903663384fac2f96e79f1812..c62be38780927ed4e61ba1323cdcd26f9fb2e30b 100644
--- a/media/base/fake_audio_render_callback.h
+++ b/media/base/fake_audio_render_callback.h
@@ -24,7 +24,7 @@ class FakeAudioRenderCallback
   // 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(double step, int sample_rate);
   ~FakeAudioRenderCallback() override;
 
   // Renders a sine wave into the provided audio data buffer.  If |half_fill_|
@@ -44,9 +44,9 @@ class FakeAudioRenderCallback
   // 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; }
@@ -54,16 +54,15 @@ class FakeAudioRenderCallback
   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_;
+  int sample_rate_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeAudioRenderCallback);
 };