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

content/renderer/media/webcontentdecryptionmodule_impl.h

Index: content/renderer/media/webcontentdecryptionmodule_impl.h
diff --git a/content/renderer/media/webcontentdecryptionmodule_impl.h b/content/renderer/media/webcontentdecryptionmodule_impl.h
new file mode 100644
index 0000000000000000000000000000000000000000..2cc5b5978d53e82f2edd9f8487bc945c643d5065
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+++ b/content/renderer/media/webcontentdecryptionmodule_impl.h
@@ -0,0 +1,32 @@
+// 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_