VideoCapture: migrate VideoCapture renderer-->host messages to mojo, part 2

content/common/video_capture_struct_traits.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 CONTENT_COMMON_VIDEO_CAPTURE_STRUCT_TRAITS_H_
+#define CONTENT_COMMON_VIDEO_CAPTURE_STRUCT_TRAITS_H_
+
+#include "content/common/video_capture.mojom.h"
+#include "media/base/video_capture_types.h"
+#include "mojo/common/common_custom_types_struct_traits.h"
+#include "services/video_capture/public/interfaces/video_capture_format.mojom.h"
+
+namespace mojo {
+
+template <>
+struct StructTraits<content::mojom::VideoCaptureParamsDataView,
+                    media::VideoCaptureParams> {
+  static media::VideoCaptureFormat requested_format(
+      const media::VideoCaptureParams& params) {
+    return params.requested_format;
+  }
+
+  static media::ResolutionChangePolicy resolution_change_policy(
+      const media::VideoCaptureParams& params) {
+    return params.resolution_change_policy;
+  }
+
+  static media::PowerLineFrequency power_line_frequency(
+      const media::VideoCaptureParams& params) {
+    return params.power_line_frequency;
+  }
+
+  static bool Read(content::mojom::VideoCaptureParamsDataView data,
+                   media::VideoCaptureParams* out);
+};
+}
+
+#endif  // CONTENT_COMMON_VIDEO_CAPTURE_STRUCT_TRAITS_H_