Reland "Adding media controls to MediaNotification"

content/browser/media/session/media_session_impl.h

 // 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.
 
 #ifndef CONTENT_BROWSER_MEDIA_SESSION_MEDIA_SESSION_IMPL_H_
 #define CONTENT_BROWSER_MEDIA_SESSION_MEDIA_SESSION_IMPL_H_
 
 #include <stddef.h>
 
 #include "base/callback_list.h"
@@ skipping 21 matching lines @@
 }  // namespace media
 
 namespace content {
 
 class AudioFocusDelegate;
 class AudioFocusManagerTest;
 class MediaSessionImplStateObserver;
 class MediaSessionImplVisibilityBrowserTest;
 class MediaSessionObserver;
 class MediaSessionPlayerObserver;
+class MediaSessionServiceImpl;
 
 #if defined(OS_ANDROID)
 class MediaSessionAndroid;
 #endif  // defined(OS_ANDROID)
 
 // MediaSessionImpl is the implementation of MediaSession. It manages the media
 // session and audio focus for a given WebContents. It is requesting the audio
 // focus, pausing when requested by the system and dropping it on demand. The
 // audio focus can be of two types: Transient or Content. A Transient audio
 // focus will allow other players to duck instead of pausing and will be
@@ skipping 64 matching lines @@
   CONTENT_EXPORT void Resume(MediaSession::SuspendType suspend_type) override;
 
   // Suspend the media session.
   // |type| represents the origin of the request.
   CONTENT_EXPORT void Suspend(MediaSession::SuspendType suspend_type) override;
 
   // Stop the media session.
   // |type| represents the origin of the request.
   CONTENT_EXPORT void Stop(MediaSession::SuspendType suspend_type) override;
 
+  // Received a media session action and forward to blink::MediaSession.
+  void DidReceiveAction(blink::mojom::MediaSessionAction action) override;
+
+  // Called when an action is enabled in blink::MediaSession. This method will
+  // notify the observers that the action is enabled.
+  void OnMediaSessionEnabledAction(blink::mojom::MediaSessionAction action);
+
+  // Called when an action is disabled in blink::MediaSession. This method will
+  // notify the observers that the action is disabled.
+  void OnMediaSessionDisabledAction(blink::mojom::MediaSessionAction action);
+
   // Let the media session start ducking such that the volume multiplier is
   // reduced.
   CONTENT_EXPORT void StartDucking();
 
   // Let the media session stop ducking such that the volume multiplier is
   // recovered.
   CONTENT_EXPORT void StopDucking();
 
   // Returns if the session can be controlled by Resume() and Suspend calls
   // above.
@@ skipping 17 matching lines @@
   CONTENT_EXPORT AudioFocusManager::AudioFocusType audio_focus_type() const {
     return audio_focus_type_;
   }
 
   // Returns whether the session has Pepper instances.
   bool HasPepper() const;
 
   // WebContentsObserver implementation
   void WebContentsDestroyed() override;
 
+  // Sets the associated MediaSessionService for communicating with
+  // blink::MediaSession.
+  MediaSessionServiceImpl* GetMediaSessionService() { return service_; }
+  void SetMediaSessionService(MediaSessionServiceImpl* service);
+
  private:
   friend class content::WebContentsUserData<MediaSessionImpl>;
   friend class ::MediaSessionImplBrowserTest;
   friend class content::MediaSessionImplVisibilityBrowserTest;
   friend class content::AudioFocusManagerTest;
   friend class content::MediaSessionImplStateObserver;
 
   CONTENT_EXPORT void SetDelegateForTests(
       std::unique_ptr<AudioFocusDelegate> delegate);
   CONTENT_EXPORT bool IsActiveForTest() const;
@@ skipping 75 matching lines @@
 
   base::Optional<MediaMetadata> metadata_;
   base::CallbackList<void(State)> media_session_state_listeners_;
 
   base::ObserverList<MediaSessionObserver> observers_;
 
 #if defined(OS_ANDROID)
   std::unique_ptr<MediaSessionAndroid> session_android_;
 #endif  // defined(OS_ANDROID)
 
+  // The MediaSessionService this session is associated with (the service of the
+  // top-level frame).
+  MediaSessionServiceImpl* service_;
+
   DISALLOW_COPY_AND_ASSIGN(MediaSessionImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_MEDIA_SESSION_MEDIA_SESSION_IMPL_H_