Add Mojo CDM Service.

media/mojo/services/mojo_cdm_promise.h

Index: media/mojo/services/mojo_cdm_promise.h
diff --git a/media/mojo/services/mojo_cdm_promise.h b/media/mojo/services/mojo_cdm_promise.h
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+++ b/media/mojo/services/mojo_cdm_promise.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_CDM_PROMISE_H_
+#define MEDIA_MOJO_SERVICES_MOJO_CDM_PROMISE_H_
+
+#include "base/callback.h"
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "media/base/cdm_promise.h"
+#include "media/mojo/interfaces/content_decryption_module.mojom.h"
+#include "mojo/public/cpp/bindings/interface_impl.h"
+
+namespace media {
+
+// media::CdmPromiseTemplate implementations backed by mojo::Callbacks.
+
+// Note: Variadic template was considered, but two parameter packs are not
+// allowed. There are ways to work around this but those end up with more
+// complicated implementation.
+
+class SimpleMojoCdmPromise : public media::CdmPromiseTemplate<> {
+ public:
+  SimpleMojoCdmPromise(
+      const mojo::Callback<void(mojo::CdmPromiseResultPtr)>& callback);
+  ~SimpleMojoCdmPromise() final;
+
+  // CdmPromiseTemplate<> implementation.
+  void resolve() final;
+  void reject(MediaKeys::Exception exception_code,
+              uint32 system_code,
+              const std::string& error_message) final;
+
+ private:
+  mojo::Callback<void(mojo::CdmPromiseResultPtr)> callback_;
+};
+
+template <typename Type, typename MojoType>
+class MojoCdmPromise : public media::CdmPromiseTemplate<Type> {
+ public:
+  MojoCdmPromise(const mojo::Callback<void(mojo::CdmPromiseResultPtr,
+                                           MojoType)>& callback);
+  ~MojoCdmPromise() final;
+
+  // CdmPromiseTemplate<> implementation.
+  void resolve(const Type& arg) final;
+  void reject(MediaKeys::Exception exception_code,
+              uint32 system_code,
+              const std::string& error_message) final;
+
+ private:
+  mojo::Callback<void(mojo::CdmPromiseResultPtr, MojoType)> callback_;
+};
+
+}  // namespace media
+
+#endif  // MEDIA_MOJO_SERVICES_MOJO_CDM_PROMISE_H_