Reland "Adding media controls to MediaNotification"

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..ab3bfc3f92a8dff7c4e705056c2709f5d69d3f48 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 +150,10 @@ bool MediaSession::removeEventListenerInternal(
 
 void MediaSession::DidReceiveAction(
     blink::mojom::blink::MediaSessionAction action) {
+  DCHECK(getExecutionContext()->isDocument());
+  Document* document = toDocument(getExecutionContext());
+  UserGestureIndicator gestureIndicator(
+      DocumentUserGestureToken::create(document));
   dispatchEvent(Event::create(mojomActionToEventName(action)));
 }