Fire CanPlayThrough immediately for local and streaming media files

media/filters/dummy_demuxer.cc

Index: media/filters/dummy_demuxer.cc
diff --git a/media/filters/dummy_demuxer.cc b/media/filters/dummy_demuxer.cc
index 095ffee762bd5362822987c3805dd272c1c3079c..2eb926c9b6d0a69ddad16bd843693a2762f62d45 100644
--- a/media/filters/dummy_demuxer.cc
+++ b/media/filters/dummy_demuxer.cc
@@ -32,9 +32,10 @@ void DummyDemuxerStream::Read(const ReadCallback& read_callback) {}
 
 void DummyDemuxerStream::EnableBitstreamConverter() {}
 
-DummyDemuxer::DummyDemuxer(bool has_video, bool has_audio)
+DummyDemuxer::DummyDemuxer(bool has_video, bool has_audio, bool local_source)
     : has_video_(has_video),
-      has_audio_(has_audio) {
+      has_audio_(has_audio),
+      local_source_(local_source) {
   streams_.resize(DemuxerStream::NUM_TYPES);
   if (has_audio)
     streams_[DemuxerStream::AUDIO] =
@@ -60,4 +61,8 @@ base::TimeDelta DummyDemuxer::GetStartTime() const {
   return base::TimeDelta();
 }
 
+bool DummyDemuxer::IsLocalSource() {
+  return local_source_;
+}
+
 }  // namespace media