Componentize EncryptedMediaMessageFilter and rename it CdmMessageFilter.

chrome/common/encrypted_media_messages_android.h

-// Copyright 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.
-
-// IPC messages for EME on android.
-// Multiply-included message file, hence no include guard.
-
-#include <vector>
-
-#include "ipc/ipc_message_macros.h"
-
-// Singly-included section for enums and custom IPC traits.
-#ifndef CHROME_COMMON_ENCRYPTED_MEDIA_MESSAGES_ANDROID_H
-#define CHROME_COMMON_ENCRYPTED_MEDIA_MESSAGES_ANDROID_H
-
-namespace android {
-
-// Defines bitmask values used to specify supported codecs.
-// Each value represents a codec within a specific container.
-enum SupportedCodecs {
-  NO_CODECS = 0,
-  WEBM_VORBIS = 1 << 0,
-  WEBM_VP8 = 1 << 1,
-  WEBM_CODECS = (WEBM_VORBIS | WEBM_VP8),
-  MP4_AAC = 1 << 2,
-  MP4_AVC1 = 1 << 3,
-  MP4_CODECS = (MP4_AAC | MP4_AVC1),
-  ALL_CODECS = (WEBM_CODECS | MP4_CODECS),
-  INVALID_CODECS = ~ALL_CODECS
-};
-
-}  // namespace android
-
-#endif  // CHROME_COMMON_ENCRYPTED_MEDIA_MESSAGES_ANDROID_H
-
-
-#define IPC_MESSAGE_START EncryptedMediaMsgStart
-
-IPC_ENUM_TRAITS(android::SupportedCodecs)
-
-IPC_STRUCT_BEGIN(SupportedKeySystemRequest)
-  IPC_STRUCT_MEMBER(std::string, key_system)
-  IPC_STRUCT_MEMBER(android::SupportedCodecs, codecs,
-                    android::NO_CODECS)
-IPC_STRUCT_END()
-
-IPC_STRUCT_BEGIN(SupportedKeySystemResponse)
-  IPC_STRUCT_MEMBER(std::string, key_system)
-  IPC_STRUCT_MEMBER(android::SupportedCodecs, compositing_codecs,
-                    android::NO_CODECS)
-  IPC_STRUCT_MEMBER(android::SupportedCodecs, non_compositing_codecs,
-                    android::NO_CODECS)
-IPC_STRUCT_END()
-
-// Messages sent from the renderer to the browser.
-
-// Synchronously get a list of supported EME key systems.
-IPC_SYNC_MESSAGE_CONTROL1_1(
-    ChromeViewHostMsg_GetSupportedKeySystems,
-    SupportedKeySystemRequest /* key system information request */,
-    SupportedKeySystemResponse /* key system information response */)