[Mojo Video Capture] Implement a VideoCaptureProvider using the Mojo service (part 2)

content/browser/renderer_host/media/service_video_capture_device_launcher.h

 // Copyright 2017 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_SERVICE_VIDEO_CAPTURE_DEVICE_LAUNCHER_H_
 #define CONTENT_BROWSER_RENDERER_HOST_MEDIA_SERVICE_VIDEO_CAPTURE_DEVICE_LAUNCHER_H_
 
 #include "content/browser/renderer_host/media/video_capture_provider.h"
 #include "content/public/common/media_stream_request.h"
 #include "services/video_capture/public/interfaces/device_factory.mojom.h"
@@ skipping 13 matching lines @@
                          MediaStreamType stream_type,
                          const media::VideoCaptureParams& params,
                          base::WeakPtr<media::VideoFrameReceiver> receiver,
                          Callbacks* callbacks,
                          base::OnceClosure done_cb) override;
   void AbortLaunch() override;
 
   void OnUtilizationReport(int frame_feedback_id, double utilization);
 
  private:
+  enum class State {
+    READY_TO_LAUNCH,
+    DEVICE_START_IN_PROGRESS,
+    DEVICE_START_ABORTING
+  };
+
+  void OnCreateDeviceCallback(
+      const media::VideoCaptureParams& params,
+      video_capture::mojom::DevicePtr device,
+      base::WeakPtr<media::VideoFrameReceiver> receiver,
+      Callbacks* callbacks,
+      base::OnceClosure done_cb,
+      video_capture::mojom::DeviceAccessResultCode result_code);
+
   video_capture::mojom::DeviceFactoryPtr* const device_factory_;
+  State state_;
+  base::SequenceChecker sequence_checker_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_MEDIA_SERVICE_VIDEO_CAPTURE_DEVICE_LAUNCHER_H_