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

content/common/video_capture_struct_traits.cc

Index: content/common/video_capture_struct_traits.cc
diff --git a/content/common/video_capture_struct_traits.cc b/content/common/video_capture_struct_traits.cc
new file mode 100644
index 0000000000000000000000000000000000000000..19f629db0f028c712a96f092e2e8f7ab64103add
--- /dev/null
+++ b/content/common/video_capture_struct_traits.cc
@@ -0,0 +1,26 @@
+// 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 "content/common/video_capture_struct_traits.h"
+
+#include "services/video_capture/public/interfaces/video_capture_device_proxy_traits.h"
+#include "services/video_capture/public/interfaces/video_capture_format_traits.h"
+
+namespace mojo {
+
+// static
+bool StructTraits<content::mojom::VideoCaptureParamsDataView,
+                  media::VideoCaptureParams>::
+    Read(content::mojom::VideoCaptureParamsDataView data,
+         media::VideoCaptureParams* out) {
+  if (!data.ReadRequestedFormat(&out->requested_format))
+    return false;
+  if (!data.ReadResolutionChangePolicy(&out->resolution_change_policy))
+    return false;
+  if (!data.ReadPowerLineFrequency(&out->power_line_frequency))
+    return false;
+  return true;
+}
+
+}  // namespace mojo