Allow optional specification of a PTS timestamp when signalling a discontinuity.

If present, rendering will be suppressed until reaching the timestamp.

Change-Id: Ic64bdf4225063c5a4d042ea9809960b843a46d19
related-to-bug: 3489454
diff --git a/media/libmedia/IStreamSource.cpp b/media/libmedia/IStreamSource.cpp
index 5069002..c14ee82 100644
--- a/media/libmedia/IStreamSource.cpp
+++ b/media/libmedia/IStreamSource.cpp
@@ -26,6 +26,9 @@
 
 namespace android {
 
+// static
+const char *const IStreamListener::kKeyResumeAtPTS = "resume-at-PTS";
+
 enum {
     // IStreamSource
     SET_LISTENER = IBinder::FIRST_CALL_TRANSACTION,