Fire CanPlayThrough immediately for local and streaming media files

media/filters/ffmpeg_demuxer.h

Index: media/filters/ffmpeg_demuxer.h
diff --git a/media/filters/ffmpeg_demuxer.h b/media/filters/ffmpeg_demuxer.h
index 0cff00f37ad12e613f760ab2c56733b298a413ec..ecb38c3024b8b11d6ad380d7c0b795257160c48f 100644
--- a/media/filters/ffmpeg_demuxer.h
+++ b/media/filters/ffmpeg_demuxer.h
@@ -148,6 +148,7 @@ class MEDIA_EXPORT FFmpegDemuxer : public Demuxer, public FFmpegURLProtocol {
   virtual void SetPreload(Preload preload) OVERRIDE;
   virtual base::TimeDelta GetStartTime() const OVERRIDE;
   virtual int GetBitrate() OVERRIDE;
+  virtual bool IsLocalSource() OVERRIDE;
 
   // FFmpegURLProtocol implementation.
   virtual size_t Read(size_t size, uint8* data) OVERRIDE;
@@ -256,6 +257,8 @@ class MEDIA_EXPORT FFmpegDemuxer : public Demuxer, public FFmpegURLProtocol {
   // is 0.
   base::TimeDelta start_time_;
 
+  bool local_source_;
+
   DISALLOW_COPY_AND_ASSIGN(FFmpegDemuxer);
 };