[Mojo Video Capture] Move conversions between mojom and media types to a separate file

services/video_capture/mojo_media_conversions.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_MOJO_MEDIA_CONVERSIONS_H_
+#define SERVICES_VIDEO_CAPTURE_MOJO_MEDIA_CONVERSIONS_H_
+
+#include "media/capture/video/video_capture_device.h"
+#include "services/video_capture/public/interfaces/video_capture_device_factory.mojom.h"
+#include "services/video_capture/public/interfaces/video_capture_device_proxy.mojom.h"
+#include "services/video_capture/public/interfaces/video_capture_format.mojom.h"
+
+namespace video_capture {
+
+// TODO(chfremer): Consider using Mojo type mapping instead of conversion
+// methods. https://crbug.com/642387
+
+media::VideoCaptureFormat ConvertFromMojoToMedia(
+    mojom::VideoCaptureFormatPtr format);
+media::VideoPixelFormat ConvertFromMojoToMedia(
+    media::mojom::VideoFormat format);
+media::VideoPixelStorage ConvertFromMojoToMedia(
+    mojom::VideoPixelStorage storage);
+media::ResolutionChangePolicy ConvertFromMojoToMedia(
+    mojom::ResolutionChangePolicy policy);
+media::PowerLineFrequency ConvertFromMojoToMedia(
+    mojom::PowerLineFrequency frequency);
+
+}  // namespace video_capture
+
+#endif  // SERVICES_VIDEO_CAPTURE_MOJO_MEDIA_CONVERSIONS_H_