Let clients interact with VideoCaptureDeviceClient instead of VideoCaptureDevice

services/video_capture/mock_video_frame_receiver.cc

+// 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.
+
+#include "services/video_capture/mock_video_frame_receiver.h"
+
+namespace video_capture {
+
+MockVideoFrameReceiver::MockVideoFrameReceiver(
+    mojom::VideoFrameReceiverRequest request)
+    : binding_(this, std::move(request)) {}
+
+MockVideoFrameReceiver::~MockVideoFrameReceiver() = default;
+
+void MockVideoFrameReceiver::OnIncomingCapturedVideoFrame(
+    media::mojom::VideoFramePtr frame) {
+  OnIncomingCapturedVideoFramePtr(&frame);
+}
+
+}  // namespace video_capture