Deliver change notifications to SourceBuffer track lists.

third_party/WebKit/Source/core/html/track/TrackListBase.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 TrackListBase_h
 #define TrackListBase_h
 
 #include "core/events/EventTarget.h"
 
 #include "core/html/HTMLMediaElement.h"
@@ skipping 41 matching lines @@
     {
         if (m_mediaElement)
             return m_mediaElement->getExecutionContext();
         return nullptr;
     }
 
     void add(T* track)
     {
         track->setMediaElement(m_mediaElement);
         m_tracks.append(track);
-        scheduleTrackEvent(EventTypeNames::addtrack, track);
+        scheduleEvent(TrackEvent::create(EventTypeNames::addtrack, track));
     }
 
     void remove(WebMediaPlayer::TrackId trackId)
     {
         for (unsigned i = 0; i < m_tracks.size(); ++i) {
             if (m_tracks[i]->id() != trackId)
                 continue;
 
             m_tracks[i]->setMediaElement(0);
-            scheduleTrackEvent(EventTypeNames::removetrack, m_tracks[i]);
+            scheduleEvent(TrackEvent::create(EventTypeNames::removetrack, m_tracks[i].get()));
             m_tracks.remove(i);
             return;
         }
         NOTREACHED();
     }
 
     void removeAll()
     {
         for (unsigned i = 0; i < m_tracks.size(); ++i)
             m_tracks[i]->setMediaElement(0);
 
         m_tracks.clear();
     }
 
     void scheduleChangeEvent()
     {
         Event* event = Event::create(EventTypeNames::change);
-        event->setTarget(this);
-        m_mediaElement->scheduleEvent(event);
+        scheduleEvent(event);

[mlamouri (slow - plz ping), 2016/08/23 13:12:27]

style: sounds like you could write this in one line.

[servolk, 2016/08/23 17:25:02]

Done.

     }
 
     Node* owner() const { return m_mediaElement; }
 
     DEFINE_INLINE_TRACE()
     {
         visitor->trace(m_tracks);
         visitor->trace(m_mediaElement);
         EventTargetWithInlineData::trace(visitor);
     }
 
     DECLARE_VIRTUAL_TRACE_WRAPPERS()
     {
         for (auto track : m_tracks) {
             visitor->traceWrappers(track);
         }
     }
 
-private:
-    void scheduleTrackEvent(const AtomicString& eventName, T* track)
+protected:
+    void scheduleEvent(Event* event)
     {
-        Event* event = TrackEvent::create(eventName, track);
         event->setTarget(this);
         m_mediaElement->scheduleEvent(event);
     }
 
+private:
     HeapVector<Member<T>> m_tracks;
     Member<HTMLMediaElement> m_mediaElement;
 };
 
 } // namespace blink
 
 #endif