Componentize EncryptedMediaMessageFilter and rename it CdmMessageFilter.

components/encrypted_media/renderer/widevine_key_systems.h

Index: components/encrypted_media/renderer/widevine_key_systems.h
diff --git a/components/encrypted_media/renderer/widevine_key_systems.h b/components/encrypted_media/renderer/widevine_key_systems.h
new file mode 100644
index 0000000000000000000000000000000000000000..1316d0ad852fae2eec9f3073b422b7f9c86c6f12
--- /dev/null
+++ b/components/encrypted_media/renderer/widevine_key_systems.h
@@ -0,0 +1,26 @@
+// 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 COMPONENTS_ENCRYPTED_MEDIA_RENDERER_WIDEVINE_KEY_SYSTEMS_H_
+#define COMPONENTS_ENCRYPTED_MEDIA_RENDERER_WIDEVINE_KEY_SYSTEMS_H_
+
+#include <vector>
+
+#include "content/public/renderer/key_system_info.h"
+
+namespace encrypted_media {
+
+#if defined(ENABLE_PEPPER_CDMS)
+void AddPepperBasedWidevine(
+    std::vector<content::KeySystemInfo>* concrete_key_systems,
+    bool is_widevine_hr_supported,
+    content::SupportedCodecs supported_codecs);
+#elif defined(OS_ANDROID)
+void AddAndroidWidevine(
+    std::vector<content::KeySystemInfo>* concrete_key_systems);
+#endif  // defined(ENABLE_PEPPER_CDMS)
+
+}  // namespace encrypted_media
+
+#endif  // COMPONENTS_ENCRYPTED_MEDIA_RENDERER_WIDEVINE_KEY_SYSTEMS_H_