Switch to double for time calculations using playback rate.

chromecast/media/cma/filters/cma_renderer.h

Index: chromecast/media/cma/filters/cma_renderer.h
diff --git a/chromecast/media/cma/filters/cma_renderer.h b/chromecast/media/cma/filters/cma_renderer.h
index 62efd7cff032c6a790e95d83009dd40732781c71..e79bcc7b67b0a58965d9c1b2415ff0b70932f183 100644
--- a/chromecast/media/cma/filters/cma_renderer.h
+++ b/chromecast/media/cma/filters/cma_renderer.h
@@ -49,7 +49,7 @@ class CmaRenderer : public ::media::Renderer {
       const base::Closure& waiting_for_decryption_key_cb) override;
   void Flush(const base::Closure& flush_cb) override;
   void StartPlayingFrom(base::TimeDelta time) override;
-  void SetPlaybackRate(float playback_rate) override;
+  void SetPlaybackRate(double playback_rate) override;
   void SetVolume(float volume) override;
   base::TimeDelta GetMediaTime() override;
   bool HasAudio() override;
@@ -136,7 +136,7 @@ class CmaRenderer : public ::media::Renderer {
   // as playback progresses.
   scoped_ptr< ::media::TimeDeltaInterpolator> time_interpolator_;
 
-  float playback_rate_;
+  double playback_rate_;
 
   base::WeakPtr<CmaRenderer> weak_this_;
   base::WeakPtrFactory<CmaRenderer> weak_factory_;