Adding clear-all button.

Change-Id: Ife637438b191c4a5004f3c6551bc75691e8e426b
diff --git a/proto/src/metrics_constants.proto b/proto/src/metrics_constants.proto
index d6f1499..a2cfae9 100644
--- a/proto/src/metrics_constants.proto
+++ b/proto/src/metrics_constants.proto
@@ -2017,6 +2017,9 @@
     // action pass package name of calling package.
     ACTION_SCOPED_DIRECTORY_ACCESS_DENIED_AND_PERSIST_BY_PACKAGE = 356;
 
+    // Logged when a user dismisses all task in overview
+    OVERVIEW_DISMISS_ALL = 357;
+
     // Add new aosp constants above this line.
     // END OF AOSP CONSTANTS
   }