Add Stubbed implementation of WebCDM* interfaces for unprefixed EME APIs.

content/renderer/media/webcontentdecryptionmodule_impl.h

+// Copyright (c) 2013 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 CONTENT_RENDERER_MEDIA_WEBCONTENTDECRYPTIONMODULE_IMPL_H_
+#define CONTENT_RENDERER_MEDIA_WEBCONTENTDECRYPTIONMODULE_IMPL_H_
+
+#include "base/string16.h"
+#include "third_party/WebKit/public/platform/WebContentDecryptionModule.h"
+
+namespace content {
+
+class WebContentDecryptionModuleImpl
+    : public WebKit::WebContentDecryptionModule {
+ public:
+  static WebContentDecryptionModuleImpl* Create(const string16& key_system);
+
+  virtual ~WebContentDecryptionModuleImpl();
+
+  // WebKit::WebContentDecryptionModule implementation.
+  virtual WebKit::WebContentDecryptionModuleSession* createSession(
+      WebKit::WebContentDecryptionModuleSession::Client*);
+
+ private:
+  explicit WebContentDecryptionModuleImpl(const string16& key_system);
+
+  DISALLOW_COPY_AND_ASSIGN(WebContentDecryptionModuleImpl);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_MEDIA_WEBCONTENTDECRYPTIONMODULE_IMPL_H_