Componentize EncryptedMediaMessageFilter and rename it CdmMessageFilter.

components/cdm/renderer/widevine_key_systems.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 COMPONENTS_CDM_RENDERER_WIDEVINE_KEY_SYSTEMS_H_
+#define COMPONENTS_CDM_RENDERER_WIDEVINE_KEY_SYSTEMS_H_
+
+#include <vector>
+
+#include "content/public/renderer/key_system_info.h"
+
+namespace cdm {
+
+enum WidevineCdmType {
+  WIDEVINE,
+#if defined(OS_ANDROID)
+  WIDEVINE_HR_NON_COMPOSITING,
+#endif  // defined(OS_ANDROID)
+};
+
+void AddWidevineWithCodecs(
+    WidevineCdmType widevine_cdm_type,
+    content::SupportedCodecs supported_codecs,
+    std::vector<content::KeySystemInfo>* concrete_key_systems);
+
+#if defined(OS_ANDROID)
+void AddAndroidWidevine(
+    std::vector<content::KeySystemInfo>* concrete_key_systems);
+#endif  // defined(OS_ANDROID)
+
+}  // namespace cdm
+
+#endif  // COMPONENTS_CDM_RENDERER_WIDEVINE_KEY_SYSTEMS_H_