Add media controls in media notification

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

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "modules/mediasession/MediaSession.h"
 
 #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>
 
 namespace blink {
 
 namespace {
 
 using ::blink::mojom::blink::MediaSessionAction;
 
@@ skipping 116 matching lines @@
           getService(m_scriptState.get())) {
     auto mojomAction = eventNameToMojomAction(eventType);
     DCHECK(mojomAction.has_value());
     service->DisableAction(mojomAction.value());
   }
   return EventTarget::removeEventListenerInternal(eventType, listener, options);
 }
 
 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)));
 }
 
 DEFINE_TRACE(MediaSession) {
   visitor->trace(m_metadata);
   EventTargetWithInlineData::trace(visitor);
 }
 
 }  // namespace blink