Reland "Adding media controls to MediaNotification"

content/public/browser/media_session.h

 // Copyright 2016 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.
 
 #ifndef CONTENT_PUBLIC_BROWSER_MEDIA_SESSION_H_
 #define CONTENT_PUBLIC_BROWSER_MEDIA_SESSION_H_
 
 #include "base/macros.h"
 #include "content/common/content_export.h"
 
+namespace blink {
+namespace mojom {
+enum class MediaSessionAction;
+}  // namespace mojom
+}  // namespace blink
+
 namespace content {
 
 class WebContents;
 
 // MediaSession manages the media session and audio focus for a given
 // WebContents. There is only one MediaSession per WebContents.
 //
 // MediaSession allows clients to observe its changes via MediaSessionObserver,
 // and allows clients to resume/suspend/stop the managed players.
 class MediaSession {
@@ skipping 18 matching lines @@
   virtual void Resume(SuspendType suspend_type) = 0;
 
   // Resume the media session.
   // |type| represents the origin of the request.
   virtual void Suspend(SuspendType suspend_type) = 0;
 
   // Resume the media session.
   // |type| represents the origin of the request.
   virtual void Stop(SuspendType suspend_type) = 0;
 
+  // Tell the media session a user action has performed.
+  virtual void DidReceiveAction(blink::mojom::MediaSessionAction action) = 0;
+
  protected:
   MediaSession() = default;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_MEDIA_SESSION_H_