[MediaControls] Listen to durationchange instead of letting HTML call methods of MediaControls

third_party/WebKit/Source/core/html/shadow/MediaControlsMediaEventListener.cpp

Index: third_party/WebKit/Source/core/html/shadow/MediaControlsMediaEventListener.cpp
diff --git a/third_party/WebKit/Source/core/html/shadow/MediaControlsMediaEventListener.cpp b/third_party/WebKit/Source/core/html/shadow/MediaControlsMediaEventListener.cpp
index 9b6dae1cd4269c01be186f647103095bc7548f31..d440d055683b93a81d63f916d456e943c92c88c7 100644
--- a/third_party/WebKit/Source/core/html/shadow/MediaControlsMediaEventListener.cpp
+++ b/third_party/WebKit/Source/core/html/shadow/MediaControlsMediaEventListener.cpp
@@ -24,6 +24,8 @@ MediaControlsMediaEventListener::MediaControlsMediaEventListener(
                                                     false);
   m_mediaControls->m_mediaElement->addEventListener(EventTypeNames::pause, this,
                                                     false);
+  m_mediaControls->m_mediaElement->addEventListener(
+      EventTypeNames::durationchange, this, false);
 
   // TextTracks events.
   TextTrackList* textTracks = m_mediaControls->m_mediaElement->textTracks();
@@ -52,6 +54,10 @@ void MediaControlsMediaEventListener::handleEvent(
     m_mediaControls->onTimeUpdate();
     return;
   }
+  if (event->type() == EventTypeNames::durationchange) {
+    m_mediaControls->onDurationChange();
+    return;
+  }
   if (event->type() == EventTypeNames::play) {
     m_mediaControls->onPlay();
     return;