AudioConverter: Express delay in frames rather than msec.

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 12 matching lines @@
  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,
-             uint32_t audio_delay_milliseconds,
+             uint32_t frames_delayed,
              uint32_t frames_skipped) override;
   MOCK_METHOD0(OnRenderError, void());
 
   // AudioTransform::ProvideAudioTransformInput implementation.
-  double ProvideInput(AudioBus* audio_bus,
-                      base::TimeDelta buffer_delay) override;
+  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 |audio_delay_milliseconds| provided to Render() or -1 if
+  // Returns the last |frames_delayed| provided to Render() or -1 if
   // no Render() call occurred.
-  int last_audio_delay_milliseconds() const {
-    return last_audio_delay_milliseconds_;
-  }
+  int last_frames_delayed() const { return last_frames_delayed_; }
 
   // Set volume information used by ProvideAudioTransformInput().
   void set_volume(double volume) { volume_ = volume; }
 
   int last_channel_count() const { return last_channel_count_; }
 
  private:
   bool half_fill_;
   double x_;
   double step_;
-  int last_audio_delay_milliseconds_;
+  int last_frames_delayed_;
   int last_channel_count_;
   double volume_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeAudioRenderCallback);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_FAKE_AUDIO_RENDER_CALLBACK_H_