media: Create Mojo StructTraits for VideoFrame

media/mojo/interfaces/traits_test_service.mojom

Index: media/mojo/interfaces/traits_test_service.mojom
diff --git a/media/mojo/interfaces/traits_test_service.mojom b/media/mojo/interfaces/traits_test_service.mojom
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+// Copyright 2017 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.
+
+module media.mojom;
+
+import "media/mojo/interfaces/media_types.mojom";
+
+interface TraitsTestService {
+  [Sync]
+  EchoVideoFrame(VideoFrame? f) => (VideoFrame? pass);
+};