Switch to double for time calculations using playback rate.

media/base/renderer.h

Index: media/base/renderer.h
diff --git a/media/base/renderer.h b/media/base/renderer.h
index e3647f75fbeee059a0b4f5631d36518cc8ba1f57..8d02fb655bfd23e16b29d86b9550f4e4bb0bb6f5 100644
--- a/media/base/renderer.h
+++ b/media/base/renderer.h
@@ -69,7 +69,7 @@ class MEDIA_EXPORT Renderer {
   virtual void StartPlayingFrom(base::TimeDelta time) = 0;
 
   // Updates the current playback rate. The default playback rate should be 1.
-  virtual void SetPlaybackRate(float playback_rate) = 0;
+  virtual void SetPlaybackRate(double playback_rate) = 0;
 
   // Sets the output volume. The default volume should be 1.
   virtual void SetVolume(float volume) = 0;