Switch to double for time calculations using playback rate.

media/base/pipeline.h

Index: media/base/pipeline.h
diff --git a/media/base/pipeline.h b/media/base/pipeline.h
index 30707b3c329303bc7664f632f8741d79c9e36ae2..ba4ecfeed20a819918cf5a7c47b7d1acedecc27f 100644
--- a/media/base/pipeline.h
+++ b/media/base/pipeline.h
@@ -154,7 +154,7 @@ class MEDIA_EXPORT Pipeline : public DemuxerHost {
   // rate.  Values for the playback rate must be greater than or equal to 0.0f.
   //
   // TODO(scherkus): What about maximum rate?  Does HTML5 specify a max?
-  void SetPlaybackRate(float playback_rate);
+  void SetPlaybackRate(double playback_rate);
 
   // Gets the current volume setting being used by the audio renderer.  When
   // the pipeline is started, this value will be 1.0f.  Valid values range
@@ -245,7 +245,7 @@ class MEDIA_EXPORT Pipeline : public DemuxerHost {
   void ErrorChangedTask(PipelineStatus error);
 
   // Carries out notifying filters that the playback rate has changed.
-  void PlaybackRateChangedTask(float playback_rate);
+  void PlaybackRateChangedTask(double playback_rate);
 
   // Carries out notifying filters that the volume has changed.
   void VolumeChangedTask(float volume);
@@ -325,7 +325,7 @@ class MEDIA_EXPORT Pipeline : public DemuxerHost {
   // Current playback rate (>= 0.0f).  This value is set immediately via
   // SetPlaybackRate() and a task is dispatched on the task runner to notify
   // the filters.
-  float playback_rate_;
+  double playback_rate_;
 
   // Current duration as reported by |demuxer_|.
   base::TimeDelta duration_;