Add Mojo CDM Service.

media/mojo/services/mojo_type_trait.h

Index: media/mojo/services/mojo_type_trait.h
diff --git a/media/mojo/services/mojo_type_trait.h b/media/mojo/services/mojo_type_trait.h
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+++ b/media/mojo/services/mojo_type_trait.h
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+// Copyright 2014 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 MEDIA_MOJO_SERVICES_MOJO_TYPE_TRAIT_H_
+#define MEDIA_MOJO_SERVICES_MOJO_TYPE_TRAIT_H_
+
+#include "media/base/media_keys.h"
+#include "mojo/public/cpp/bindings/array.h"
+#include "mojo/public/cpp/bindings/string.h"
+
+namespace media {
+
+// A trait class to help get the corresponding mojo type for a native type.
+template <typename T>
+class MojoTypeTrait {};
+
+template <>
+struct MojoTypeTrait<std::string> {
+  typedef mojo::String MojoType;
+  static MojoType DefaultValue() { return MojoType(); }
+};
+
+template <>
+struct MojoTypeTrait<KeyIdsVector> {
+  typedef mojo::Array<mojo::Array<uint8_t>> MojoType;
+  static MojoType DefaultValue() { return MojoType(); }
+};
+
+}  // namespace media
+
+#endif  // MEDIA_MOJO_SERVICES_MOJO_TYPE_TRAIT_H_