MediaCas: add MediaCasService

This CL adds API only without implementation.

bug: 22804304
Change-Id: Ibb5a29cc616ec0af81957b2bfe1419c482591753
diff --git a/media/libmedia/MediaDefs.cpp b/media/libmedia/MediaDefs.cpp
index 2ae71f7..544a6ae 100644
--- a/media/libmedia/MediaDefs.cpp
+++ b/media/libmedia/MediaDefs.cpp
@@ -29,6 +29,7 @@
 const char *MEDIA_MIMETYPE_VIDEO_MPEG2 = "video/mpeg2";
 const char *MEDIA_MIMETYPE_VIDEO_RAW = "video/raw";
 const char *MEDIA_MIMETYPE_VIDEO_DOLBY_VISION = "video/dolby-vision";
+const char *MEDIA_MIMETYPE_VIDEO_SCRAMBLED = "video/scrambled";
 
 const char *MEDIA_MIMETYPE_AUDIO_AMR_NB = "audio/3gpp";
 const char *MEDIA_MIMETYPE_AUDIO_AMR_WB = "audio/amr-wb";
@@ -48,6 +49,7 @@
 const char *MEDIA_MIMETYPE_AUDIO_MSGSM = "audio/gsm";
 const char *MEDIA_MIMETYPE_AUDIO_AC3 = "audio/ac3";
 const char *MEDIA_MIMETYPE_AUDIO_EAC3 = "audio/eac3";
+const char *MEDIA_MIMETYPE_AUDIO_SCRAMBLED = "audio/scrambled";
 
 const char *MEDIA_MIMETYPE_CONTAINER_MPEG4 = "video/mp4";
 const char *MEDIA_MIMETYPE_CONTAINER_WAV = "audio/x-wav";