Pause autoplay muted video when unmuting if there's no user gesture

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 7079ba7e9dfd636e082a54d1122e4ceb27400671..331a06c88bcee6e3001349418be3edf341f982c6 100644
--- a/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
@@ -2283,6 +2283,9 @@ void HTMLMediaElement::setMuted(bool muted)
 {
     DVLOG(MEDIA_LOG_LEVEL) << "setMuted(" << (void*)this << ", " << boolString(muted) << ")";
 
+    if (UserGestureIndicator::processingUserGesture())
+        unlockUserGesture();
+
     if (m_muted == muted)
         return;
 
@@ -2297,6 +2300,10 @@ void HTMLMediaElement::setMuted(bool muted)
         Platform::current()->recordAction(UserMetricsAction("Media_Playback_Mute_Off"));
 
     scheduleEvent(EventTypeNames::volumechange);
+
+    // Pause the element when unmuting if it's still locked.
+    if (!muted && isGestureNeededForPlayback())
+        pause();
 }
 
 void HTMLMediaElement::updateVolume()