Clear m_autoplaying when starting auto playback.

third_party/WebKit/Source/core/html/HTMLMediaElement.cpp

Index: third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp b/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
index f3c4ad3860e506678b34be4e784a8ada27ae72ed..25248028a17e8db33949385e1867c530ae4a6315 100644
--- a/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
@@ -1994,7 +1994,6 @@ void HTMLMediaElement::playInternal()
         else if (m_readyState >= HAVE_FUTURE_DATA)
             scheduleEvent(EventTypeNames::playing);
     }
-    m_autoplaying = false;

[philipj_slow, 2015/12/01 09:45:39]

This should actually stay, and if removing it doesn't cause any tests to fail,
then we have a problem!

[liberato (no reviews please), 2015/12/01 23:53:52]

Done.

 
     updatePlayState();
 }
@@ -2945,6 +2944,7 @@ void HTMLMediaElement::updatePlayState()
             mediaControls()->playbackStarted();
         startPlaybackProgressTimer();
         m_playing = true;
+        m_autoplaying = false;

[philipj_slow, 2015/12/01 09:45:39]

This is not the place where it's cleared in the spec, right after
scheduleEvent(EventTypeNames::playing) in HTMLMediaElement::setReadyState should
do it.

[liberato (no reviews please), 2015/12/01 23:53:52]

Done.

         recordAutoplayMetric(AnyPlaybackStarted);
 
     } else { // Should not be playing right now