Add logging for bubble flyout action.

Bug: 123543171
Test: manual
Change-Id: I7b0a21c0a0c23c211e4c72ec5b2dfc7ea60537d6
diff --git a/atoms.proto b/atoms.proto
index 90ba7ce..0d55855 100644
--- a/atoms.proto
+++ b/atoms.proto
@@ -5575,6 +5575,7 @@
         SWIPE_LEFT = 13;
         SWIPE_RIGHT = 14;
         STACK_EXPANDED = 15;
+        FLYOUT = 16;
     }
     optional Action action = 6;