Support for parsing encrypted WebM streams by src.

media/base/demuxer.h

Index: media/base/demuxer.h
diff --git a/media/base/demuxer.h b/media/base/demuxer.h
index 34150af00b3f9c9a433b7d886cbbed433a1a5b4f..e2f1962224caec94797a2deae47bd49bf4309c8c 100644
--- a/media/base/demuxer.h
+++ b/media/base/demuxer.h
@@ -64,6 +64,8 @@ class MEDIA_EXPORT Demuxer : public base::RefCountedThreadSafe<Demuxer> {
   // Returns the starting time for the media file.
   virtual base::TimeDelta GetStartTime() const = 0;
 
+  virtual void KeyAdded();
+
  protected:
   friend class base::RefCountedThreadSafe<Demuxer>;
   virtual ~Demuxer();