Refactor VideoCaptureManager::GetDeviceFormatsInUse()

content/browser/renderer_host/media/video_capture_controller.h

 // 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.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_CONTROLLER_H_
 #define CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_CONTROLLER_H_
 
 #include <list>
 #include <memory>
 
@@ skipping 79 matching lines @@
 
   // Return a buffer with id |buffer_id| previously given in
   // VideoCaptureControllerEventHandler::OnBufferReady.
   // If the consumer provided resource utilization
   // feedback, this will be passed here (-1.0 indicates no feedback).
   void ReturnBuffer(VideoCaptureControllerID id,
                     VideoCaptureControllerEventHandler* event_handler,
                     int buffer_id,
                     double consumer_resource_utilization);
 
-  const media::VideoCaptureFormat& GetVideoCaptureFormat() const;
+  const base::Optional<media::VideoCaptureFormat> GetVideoCaptureFormat() const;
 
   bool has_received_frames() const { return has_received_frames_; }
 
   // Implementation of media::VideoFrameReceiver interface:
   void OnNewBufferHandle(
       int buffer_id,
       std::unique_ptr<media::VideoCaptureDevice::Client::Buffer::HandleProvider>
           handle_provider) override;
   void OnFrameReadyInBuffer(
       int buffer_id,
@@ skipping 123 matching lines @@
 
   // Takes on only the states 'STARTING', 'STARTED' and 'ERROR'. 'ERROR' is an
   // absorbing state which stops the flow of data to clients.
   VideoCaptureState state_;
 
   int next_buffer_context_id_ = 0;
 
   // True if the controller has received a video frame from the device.
   bool has_received_frames_;
 
-  media::VideoCaptureFormat video_capture_format_;
+  base::Optional<media::VideoCaptureFormat> video_capture_format_;
 
   base::WeakPtrFactory<VideoCaptureController> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoCaptureController);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_VIDEO_CAPTURE_CONTROLLER_H_