[Mojo Video Capture] Simplify API and some cleanups

services/video_capture/public/interfaces/video_capture_settings_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 SERVICES_VIDEO_CAPTURE_PUBLIC_INTERFACES_VIDEO_CAPTURE_SETTINGS_TRAITS_H_
+#define SERVICES_VIDEO_CAPTURE_PUBLIC_INTERFACES_VIDEO_CAPTURE_SETTINGS_TRAITS_H_
+
+#include "media/capture/video_capture_types.h"
+#include "mojo/common/common_custom_types_struct_traits.h"
+#include "services/video_capture/public/interfaces/video_capture_device_proxy.mojom.h"
+
+namespace mojo {
+
+template <>
+struct StructTraits<video_capture::mojom::VideoCaptureFormatDataView,
+                    video_capture::VideoCaptureFormat> {
+  static const gfx::Size& frame_size(
+      const video_capture::VideoCaptureFormat& input) {
+    return input.frame_size;
+  }
+
+  static float frame_rate(const video_capture::VideoCaptureFormat& input) {
+    return input.frame_rate;
+  }
+
+  static bool Read(video_capture::mojom::VideoCaptureFormatDataView data,
+                   video_capture::VideoCaptureFormat* out);
+};
+
+template <>
+struct StructTraits<video_capture::mojom::VideoCaptureSettingsDataView,
+                    video_capture::VideoCaptureSettings> {
+  static const video_capture::VideoCaptureFormat& format(
+      const video_capture::VideoCaptureSettings& input) {
+    return input.format;
+  }
+
+  static media::ResolutionChangePolicy resolution_change_policy(
+      const video_capture::VideoCaptureSettings& input) {
+    return input.resolution_change_policy;
+  }
+
+  static media::PowerLineFrequency power_line_frequency(
+      const video_capture::VideoCaptureSettings& input) {
+    return input.power_line_frequency;
+  }
+
+  static bool Read(video_capture::mojom::VideoCaptureSettingsDataView data,
+                   video_capture::VideoCaptureSettings* out);
+};
+}
+
+#endif  // SERVICES_VIDEO_CAPTURE_PUBLIC_INTERFACES_VIDEO_CAPTURE_SETTINGS_TRAITS_H_