Switch to double for time calculations using playback rate.

chromecast/media/cma/pipeline/media_pipeline.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 CHROMECAST_MEDIA_CMA_PIPELINE_MEDIA_PIPELINE_H_
 #define CHROMECAST_MEDIA_CMA_PIPELINE_MEDIA_PIPELINE_H_
 
 #include "base/basictypes.h"
 #include "base/macros.h"
 #include "base/time/time.h"
@@ skipping 39 matching lines @@
       const ::media::VideoDecoderConfig& config,
       scoped_ptr<CodedFrameProvider> frame_provider,
       const ::media::PipelineStatusCB& status_cb) = 0;
 
   // Control the media pipeline state machine.
   virtual void StartPlayingFrom(base::TimeDelta time) = 0;
   virtual void Flush(const ::media::PipelineStatusCB& status_cb) = 0;
   virtual void Stop() = 0;
 
   // Set the playback rate.
-  virtual void SetPlaybackRate(float playback_rate) = 0;
+  virtual void SetPlaybackRate(double playback_rate) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MediaPipeline);
 };
 
 }  // namespace media
 }  // namespace chromecast
 
 #endif  // CHROMECAST_MEDIA_CMA_PIPELINE_MEDIA_PIPELINE_H_