Count how often a Media Fragments URI is applied in HTMLMediaElement

Source/core/html/HTMLMediaElement.cpp

Index: Source/core/html/HTMLMediaElement.cpp
diff --git a/Source/core/html/HTMLMediaElement.cpp b/Source/core/html/HTMLMediaElement.cpp
index 35f8cd734ac77d7fa55aba347ec080f1add8dda1..827ded9982188a31317042a0b5ac9d6287e4e0e2 100644
--- a/Source/core/html/HTMLMediaElement.cpp
+++ b/Source/core/html/HTMLMediaElement.cpp
@@ -2404,6 +2404,7 @@ void HTMLMediaElement::playbackProgressTimerFired(Timer<HTMLMediaElement>*)
     if (m_fragmentEndTime != MediaPlayer::invalidTime() && currentTime() >= m_fragmentEndTime && m_playbackRate > 0) {
         m_fragmentEndTime = MediaPlayer::invalidTime();
         if (!m_mediaController && !m_paused) {

[acolwell GONE FROM CHROMIUM, 2014/03/04 01:22:15]

The mediaController portion of this condition seems rather odd. It seems like
the element should pause independent of the controller. Is this backed by the
spec somewhere? I would expect the entire presentation to pause or at least it
to continue w/o this element playing anything further. It just seems weird to
continue as if the end time wasn't specified at all.

[philipj_slow, 2014/03/04 03:53:20]

I hadn't given the controller condition any thought, but I agree that it's
weird. None of this is backed by a spec because no spec says how the fragment
end time interacts with HTMLMediaElement at all, I suppose this just seemed
sensible at the time of implementation. If no one else in the linked discussion
thread does, I'll file a HTML spec bug to specify how the fragment end time is
supposed to work.

+            UseCounter::count(document(), UseCounter::HTMLMediaElementPauseAtFragmentEnd);
             // changes paused to true and fires a simple event named pause at the media element.
             pause();
         }
@@ -3855,6 +3856,7 @@ void HTMLMediaElement::applyMediaFragmentURI()
 {
     if (m_fragmentStartTime != MediaPlayer::invalidTime()) {
         m_sentEndEvent = false;
+        UseCounter::count(document(), UseCounter::HTMLMediaElementSeekToFragmentStart);
         seek(m_fragmentStartTime, IGNORE_EXCEPTION);
     }
 }