media: Generalize MediaPermissionDispatcher.

content/renderer/media/media_permission_dispatcher.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_RENDERER_MEDIA_MEDIA_PERMISSION_DISPATCHER_H_
 #define CONTENT_RENDERER_MEDIA_MEDIA_PERMISSION_DISPATCHER_H_
 
 #include <map>
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "content/common/content_export.h"
 #include "content/common/permission_service.mojom.h"
 #include "content/public/renderer/render_frame_observer.h"
 #include "media/base/media_permission.h"
 
 namespace base {
 class SingleThreadTaskRunner;
 }
 
 namespace content {
 
-// MediaPermission implementation in content. This class is not thread safe
-// and should only be used on one thread.
-class CONTENT_EXPORT MediaPermissionDispatcher : public media::MediaPermission,
-                                                 public RenderFrameObserver {
+// MediaPermission implementation.
+class CONTENT_EXPORT MediaPermissionDispatcher : public media::MediaPermission {
  public:
-  explicit MediaPermissionDispatcher(RenderFrame* render_frame);
+  using ConnectToServiceCB =
+      base::Callback<void(mojo::InterfaceRequest<PermissionService>)>;
+
+  explicit MediaPermissionDispatcher(
+      const ConnectToServiceCB& connect_to_service_cb);
   ~MediaPermissionDispatcher() override;
 
   // media::MediaPermission implementation.
   // Note: Can be called on any thread. The |permission_status_cb| will always
   // be fired on the thread where these methods are called.
   void HasPermission(Type type,
                      const GURL& security_origin,
                      const PermissionStatusCB& permission_status_cb) override;
   void RequestPermission(
       Type type,
       const GURL& security_origin,
       const PermissionStatusCB& permission_status_cb) override;
 
  private:
   // Map of request IDs and pending PermissionStatusCBs.
   typedef std::map<uint32_t, PermissionStatusCB> RequestMap;
 
   // Register PermissionStatusCBs. Returns |request_id| that can be used to make
   // PermissionService calls.
   uint32_t RegisterCallback(const PermissionStatusCB& permission_status_cb);
 
   // Callback for |permission_service_| calls.
   void OnPermissionStatus(uint32_t request_id, PermissionStatus status);
 
+  ConnectToServiceCB connect_to_service_cb_;
   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
   uint32_t next_request_id_;
   RequestMap requests_;
   PermissionServicePtr permission_service_;
 
   base::WeakPtrFactory<MediaPermissionDispatcher> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaPermissionDispatcher);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_MEDIA_PERMISSION_DISPATCHER_H_