Rmoving the notion of task runner from MediaStreamProvider interface.

content/browser/renderer_host/media/video_capture_manager.h

-  // Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Copyright (c) 2012 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.
 
 // VideoCaptureManager is used to open/close, start/stop, enumerate available
 // video capture devices, and manage VideoCaptureController's.
 // All functions are expected to be called from Browser::IO thread. Some helper
 // functions (*OnDeviceThread) will dispatch operations to the device thread.
 // VideoCaptureManager will open OS dependent instances of VideoCaptureDevice.
 // A device can only be opened once.
 
@@ skipping 31 matching lines @@
 
 // VideoCaptureManager opens/closes and start/stops video capture devices.
 class CONTENT_EXPORT VideoCaptureManager : public MediaStreamProvider {
  public:
   using VideoCaptureDevice = media::VideoCaptureDevice;
 
   // Callback used to signal the completion of a controller lookup.
   using DoneCB =
       base::Callback<void(const base::WeakPtr<VideoCaptureController>&)>;
 
-  explicit VideoCaptureManager(
-      std::unique_ptr<media::VideoCaptureDeviceFactory> factory);
-
-  void Unregister();
+  VideoCaptureManager(
+      std::unique_ptr<media::VideoCaptureDeviceFactory> factory,
+      scoped_refptr<base::SingleThreadTaskRunner> device_task_runner);
 
   // Implements MediaStreamProvider.
-  void Register(MediaStreamProviderListener* listener,
-                const scoped_refptr<base::SingleThreadTaskRunner>&
-                    device_task_runner) override;
+  void RegisterListener(MediaStreamProviderListener* listener) override;
+  void UnregisterListener() override;
   int Open(const StreamDeviceInfo& device) override;
   void Close(int capture_session_id) override;
 
   // Called by VideoCaptureHost to locate a capture device for |capture_params|,
   // adding the Host as a client of the device's controller if successful. The
   // value of |session_id| controls which device is selected;
   // this value should be a session id previously returned by Open().
   //
   // If the device is not already started (i.e., no other client is currently
   // capturing from this device), this call will cause a VideoCaptureController
@@ skipping 283 matching lines @@
   // Map used by DesktopCapture.
   std::map<media::VideoCaptureSessionId, gfx::NativeViewId>
       notification_window_ids_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoCaptureManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_MANAGER_H_