[Presentation API] (3rd) (1-UA) Split PresentationServiceDelegateImpl(PSDImpl)

chrome/browser/media/router/presentation_service_delegate_observers.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 CHROME_BROWSER_MEDIA_ROUTER_PRESENTATION_SERVICE_DELEGATE_OBSERVERS_H_
+#define CHROME_BROWSER_MEDIA_ROUTER_PRESENTATION_SERVICE_DELEGATE_OBSERVERS_H_
+
+#include <map>
+
+#include "chrome/browser/media/router/render_frame_host_id.h"
+#include "content/public/browser/presentation_service_delegate.h"
+
+namespace media_router {
+
+class PresentationServiceDelegateObservers {
+ public:
+  PresentationServiceDelegateObservers();
+  virtual ~PresentationServiceDelegateObservers();
+
+  // Registers an observer associated with frame with |render_process_id|
+  // and |render_frame_id| with this class to listen for updates.
+  // This class does not own the observer.
+  // It is an error to add an observer if there is already an observer for that
+  // frame.
+  virtual void AddObserver(
+      int render_process_id,
+      int render_frame_id,
+      content::PresentationServiceDelegate::Observer* observer);
+
+  // Unregisters the observer associated with the frame with |render_process_id|
+  // and |render_frame_id|.
+  // The observer will no longer receive updates.
+  virtual void RemoveObserver(int render_process_id, int render_frame_id);
+
+ private:
+  std::map<RenderFrameHostId, content::PresentationServiceDelegate::Observer*>
+      observers_;
+};
+
+}  // namespace media_router
+
+#endif  // CHROME_BROWSER_MEDIA_ROUTER_PRESENTATION_SERVICE_DELEGATE_OBSERVERS_H_