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 441ee5b55a8b6e020d888087c1062bc553bea0e0..bf72ca0499e69b0bf99442d9f11d7ecc1269eeee 100644
--- a/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLMediaElement.cpp
@@ -2260,6 +2260,9 @@ void HTMLMediaElement::setMuted(bool muted)
 {
     DVLOG(MEDIA_LOG_LEVEL) << "setMuted(" << (void*)this << ", " << boolString(muted) << ")";
 
+    if (UserGestureIndicator::processingUserGesture())
+        unlockUserGesture();
+
     if (m_muted == muted)
         return;
 
@@ -2274,6 +2277,10 @@ void HTMLMediaElement::setMuted(bool muted)
         Platform::current()->recordAction(UserMetricsAction("Media_Playback_Mute_Off"));
 
     scheduleEvent(EventTypeNames::volumechange);
+
+    // Pause the element when unmuting if there was no user gesture.

[mlamouri (slow - plz ping), 2016/06/09 17:43:16]

nit: s/if there was no user gesture./if the element is still locked./

+    if (!muted && isGestureNeededForPlayback())
+        pause();
 }
 
 void HTMLMediaElement::updateVolume()