Deliver change notifications to SourceBuffer track lists.

third_party/WebKit/Source/core/html/HTMLMediaSource.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 24 matching lines @@
 #include "core/html/URLRegistry.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Forward.h"
 #include <memory>
 
 namespace blink {
 
 class WebMediaSource;
 class HTMLMediaElement;
 class TimeRanges;
+class TrackBase;
 
 class CORE_EXPORT HTMLMediaSource : public URLRegistrable, public GarbageCollectedMixin {
 public:
     static void setRegistry(URLRegistry*);
     static HTMLMediaSource* lookup(const String& url) { return s_registry ? static_cast<HTMLMediaSource*>(s_registry->lookup(url)) : 0; }
 
     // Called when an HTMLMediaElement is attempting to attach to this object,
     // and helps enforce attachment to at most one element at a time.
     // If already attached, returns false. Otherwise, must be in
     // 'closed' state, and returns true to indicate attachment success.
     // Reattachment allowed by first calling close() (even if already in 'closed').
     // Once attached, the source uses the element to synchronously service some
     // API operations like duration change that may need to initiate seek.
     virtual bool attachToElement(HTMLMediaElement*) = 0;
     virtual void setWebMediaSourceAndOpen(std::unique_ptr<WebMediaSource>) = 0;
     virtual void close() = 0;
     virtual bool isClosed() const = 0;
     virtual double duration() const = 0;
     virtual TimeRanges* buffered() const = 0;
     virtual TimeRanges* seekable() const = 0;
+    virtual void onTrackChanged(TrackBase*) = 0;
 
     // URLRegistrable
     URLRegistry& registry() const override { return *s_registry; }
 
 private:
     static URLRegistry* s_registry;
 };
 
 } // namespace blink
 
 #endif