Create Pepper-based CDM for EME WD (Blink changes)

Source/web/MediaKeysClientImpl.h

+// 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 MediaKeysClientImpl_h
+#define MediaKeysClientImpl_h
+
+#include "modules/encryptedmedia/MediaKeysClient.h"
+
+namespace blink {
+
+class WebContentDecryptionModule;
+class WebViewImpl;
+
+class MediaKeysClientImpl FINAL : public WebCore::MediaKeysClient {
+public:
+    static PassOwnPtr<MediaKeysClientImpl> create();
+
+    // WebCore::MediaKeysClient implementation.
+    virtual WebContentDecryptionModule* createContentDecryptionModule(WebCore::ExecutionContext*, const String& keySystem) OVERRIDE;
+
+private:
+    MediaKeysClientImpl();
+};
+
+} // namespace blink
+
+#endif // MediaKeysClientImpl_h