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..65ddd93666b182f36dcedc0414d04eab2e9e6d6f 100644
--- a/third_party/WebKit/Source/modules/mediasession/MediaSession.cpp
+++ b/third_party/WebKit/Source/modules/mediasession/MediaSession.cpp
@@ -6,12 +6,14 @@
 
 #include "bindings/core/v8/ScriptState.h"
 #include "core/dom/Document.h"
+#include "core/dom/DocumentUserGestureToken.h"
 #include "core/dom/ExecutionContext.h"
 #include "core/events/Event.h"
 #include "core/frame/LocalFrame.h"
 #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 +150,11 @@ bool MediaSession::removeEventListenerInternal(
 
 void MediaSession::DidReceiveAction(
     blink::mojom::blink::MediaSessionAction action) {
+  Document* document = nullptr;
+  if (m_scriptState->domWindow())

[whywhat, 2016/10/28 16:38:02]

I think you should use something like this:

  DCHECK(getExecutionContext()->isDocument());
  Document* document = toDocument(getExecutionContext());

Move it to a separate method (getDocument()) if it's used somewhere else.

[Zhiqiang Zhang (Slow), 2016/11/01 14:55:25]

Done.

+    document = m_scriptState->domWindow()->document();
+  UserGestureIndicator gestureIndicator(
+      DocumentUserGestureToken::create(document));
   dispatchEvent(Event::create(mojomActionToEventName(action)));
 }