Make default media::Renderer::playback_rate = 0.

media/base/time_delta_interpolator.h

 // Copyright 2014 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_TIME_DELTA_INTERPOLATOR_H_
 #define MEDIA_BASE_TIME_DELTA_INTERPOLATOR_H_
 
 #include "base/macros.h"
 #include "base/time/time.h"
 #include "media/base/media_export.h"
@@ skipping 22 matching lines @@
   //
   // |tick_clock| will be queried for a new reference time value.
   base::TimeDelta StartInterpolating();
 
   // Stops returning interpolated TimeDelta values.
   //
   // |tick_clock| will be queried for a new reference time value.
   base::TimeDelta StopInterpolating();
 
   // Sets a new rate at which to interpolate.
+  // The default rate is 0.
   //
   // |tick_clock| will be queried for a new reference time value.
   void SetPlaybackRate(double playback_rate);
 
   // Sets the two timestamps to interpolate between at |playback_rate_|.
   // |upper_bound| must be greater or equal to |lower_bound|.
   //
   // |upper_bound| is typically the media timestamp of the last audio frame
   // buffered by the audio hardware.
   void SetBounds(base::TimeDelta lower_bound, base::TimeDelta upper_bound);
@@ skipping 20 matching lines @@
   base::TimeTicks reference_;
 
   double playback_rate_;
 
   DISALLOW_COPY_AND_ASSIGN(TimeDeltaInterpolator);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_TIME_DELTA_INTERPOLATOR_H_