Implement async event callout from drm plugin to Java app

Change-Id: I007f147d693664e777b8758be2bb8a4c7ec0236b
diff --git a/media/libmedia/Android.mk b/media/libmedia/Android.mk
index 1ada9c3..fbe71ad 100644
--- a/media/libmedia/Android.mk
+++ b/media/libmedia/Android.mk
@@ -20,6 +20,7 @@
     IAudioRecord.cpp \
     ICrypto.cpp \
     IDrm.cpp \
+    IDrmClient.cpp \
     IHDCP.cpp \
     AudioRecord.cpp \
     AudioSystem.cpp \