media: Add getStopTimeOffsetUs in GraphicBufferSource.

Test: Compiles
Bug: 35925528
Change-Id: Ie469e42c986211540880f04a5e47efc090817ba8
diff --git a/media/omx/1.0/IGraphicBufferSource.hal b/media/omx/1.0/IGraphicBufferSource.hal
index 62073ad..49383c0 100644
--- a/media/omx/1.0/IGraphicBufferSource.hal
+++ b/media/omx/1.0/IGraphicBufferSource.hal
@@ -43,6 +43,8 @@
 
     setStopTimeUs(int64_t stopTimeUs) generates (Status status);
 
+    getStopTimeOffsetUs() generates (Status status, int64_t stopTimeOffsetUs);
+
     setColorAspects(ColorAspects aspects) generates (Status status);
 
     setTimeOffsetUs(int64_t timeOffsetUs) generates (Status status);