Add media controls in media notification

third_party/WebKit/Source/modules/mediasession/MediaSession.cpp

Index: third_party/WebKit/Source/modules/mediasession/MediaSession.cpp
diff --git a/third_party/WebKit/Source/modules/mediasession/MediaSession.cpp b/third_party/WebKit/Source/modules/mediasession/MediaSession.cpp
index af2ae8f94ff1df8ff4f934ebf11ab2582ddd4785..d896e76d6188d67ee60585c9a7fbef59b21ea87f 100644
--- a/third_party/WebKit/Source/modules/mediasession/MediaSession.cpp
+++ b/third_party/WebKit/Source/modules/mediasession/MediaSession.cpp
@@ -12,6 +12,7 @@
 #include "modules/EventTargetModules.h"
 #include "modules/mediasession/MediaMetadata.h"
 #include "modules/mediasession/MediaMetadataSanitizer.h"
+#include "platform/UserGestureIndicator.h"
 #include "public/platform/InterfaceProvider.h"
 #include "wtf/Optional.h"
 #include <memory>
@@ -148,6 +149,7 @@ bool MediaSession::removeEventListenerInternal(
 
 void MediaSession::DidReceiveAction(
     blink::mojom::blink::MediaSessionAction action) {
+  UserGestureIndicator gestureIndicator(UserGestureToken::create());

[whywhat, 2016/10/24 20:54:01]

Have you checked this actually sets the user gesture for the time when the event
is processed? I'd assume dispatchEvent to work asynchronously and
UserGestureIndicator not surviving that.

[mlamouri (slow - plz ping), 2016/10/25 10:38:13]

I think dispatchEvent() is sync, see EventTarget::dispatchEvent()

   dispatchEvent(Event::create(mojomActionToEventName(action)));
 }