Migrating MediaSession messages to mojo

third_party/WebKit/public/platform/modules/mediasession/WebMediaSession.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 WebMediaSession_h
-#define WebMediaSession_h
-
-#include "public/platform/WebCallbacks.h"
-#include "public/platform/modules/mediasession/WebMediaSessionError.h"
-
-namespace blink {
-
-using WebMediaSessionActivateCallback =
-    WebCallbacks<void, const WebMediaSessionError&>;
-using WebMediaSessionDeactivateCallback = WebCallbacks<void, void>;
-
-struct WebMediaMetadata;
-
-class WebMediaSession {
- public:
-  enum {
-    // The media session for media elements that don't have an
-    // explicit user created media session set.
-    DefaultID = 0
-  };
-
-  virtual ~WebMediaSession() = default;
-
-  // Tries to activate the session by requesting audio focus from
-  // the system. May fail if audio focus is denied by the
-  // system. The ownership of the pointer is transferred to the
-  // WebMediaSession implementation.
-  virtual void activate(WebMediaSessionActivateCallback*) = 0;
-
-  // Deactivates the session by abandoning audio focus. Will not
-  // fail in way visible to the user of the WebMediaSession. The
-  // ownership of the pointer is transferred to the WebMediaSession
-  // implementation.
-  virtual void deactivate(WebMediaSessionDeactivateCallback*) = 0;
-
-  // Updates the metadata associated with the WebMediaSession. The metadata
-  // can be a nullptr in which case the assouciated metadata should be reset.
-  // The pointer is not owned by the WebMediaSession implementation.
-  virtual void setMetadata(const WebMediaMetadata*) = 0;
-};
-
-}  // namespace blink
-
-#endif  // WebMediaSession_h