[Mojo Video Capture] Adapt video_capture service to refactored video capture stack

services/video_capture/public/cpp/device_to_feedback_observer_adapter.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 SERVICES_VIDEO_CAPTURE_PUBLIC_CPP_DEVICE_TO_FEEDBACK_OBSERVER_ADAPTER_H_
+#define SERVICES_VIDEO_CAPTURE_PUBLIC_CPP_DEVICE_TO_FEEDBACK_OBSERVER_ADAPTER_H_
+
+#include "media/capture/video/video_capture_device.h"
+#include "services/video_capture/public/interfaces/device.mojom.h"
+
+namespace video_capture {
+
+// Adapter that allows a video_capture::mojom::Device to be used in place of
+// a media::VideoFrameConsumerFeedbackObserver
+class DeviceToFeedbackObserverAdapter
+    : public media::VideoFrameConsumerFeedbackObserver {
+ public:
+  DeviceToFeedbackObserverAdapter(mojom::DevicePtr device);
+  ~DeviceToFeedbackObserverAdapter() override;
+
+  // media::VideoFrameConsumerFeedbackObserver:
+  void OnUtilizationReport(int frame_feedback_id, double utilization) override;
+
+ private:
+  mojom::DevicePtr device_;
+};
+
+}  // namespace video_capture
+
+#endif  // SERVICES_VIDEO_CAPTURE_PUBLIC_CPP_DEVICE_TO_FEEDBACK_OBSERVER_ADAPTER_H_