Break down jank between frame drops vs. triple buffered

Bug: 70220906
Test: JankyScene vs. systrace vs. jankstats
Change-Id: Ia012685020cc5bcabbd3f92f0bdeb84eaf50733d
diff --git a/libs/hwui/ProfileData.h b/libs/hwui/ProfileData.h
index 1e688ab..564920b 100644
--- a/libs/hwui/ProfileData.h
+++ b/libs/hwui/ProfileData.h
@@ -33,6 +33,7 @@
     kSlowUI,
     kSlowSync,
     kSlowRT,
+    kMissedDeadline,
 
     // must be last
     NUM_BUCKETS,