Expose media controls to accessibility

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 109 matching lines @@
   // |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;
 
+  // Let the media session start ducking such that the volume multiplier is
+  // reduced.
+  CONTENT_EXPORT void StartDucking() override;
+
+  // Let the media session stop ducking such that the volume multiplier is
+  // recovered.
+  CONTENT_EXPORT void StopDucking() 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.
   CONTENT_EXPORT bool IsControllable() const;
 
   // Returns if the session is currently active.
   CONTENT_EXPORT bool IsActive() const;
 
   // Returns if the session is currently suspended.
   // TODO(mlamouri): IsSuspended() below checks if the state is not ACTIVE
   // instead of checking if the state is SUSPENDED. In order to not have to
@@ skipping 123 matching lines @@
   // 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_