Add metrics logging for Settings -> Help & Feedback

Add new metrics event constant for Settings->Help & Feedback, and log it
whenever user selects the help option menu, passing the context extra for
the corresponding settings preference where the help menu is launched.

Change-Id: I971e8e50b959a5451ed085e5da5fd8504111e6c3
Fixes: 30140281
diff --git a/proto/src/metrics_constants.proto b/proto/src/metrics_constants.proto
index 29d1e7a..8c8b391 100644
--- a/proto/src/metrics_constants.proto
+++ b/proto/src/metrics_constants.proto
@@ -2266,6 +2266,10 @@
     // Package: Package of print service
     ACTION_PRINT_RECOMMENDED_SERVICE_INSTALL = 512;
 
+    // ACTION: Settings -> [sub settings activity] -> Options menu -> Help & Support
+    //   SUBTYPE: sub settings classname
+    ACTION_SETTING_HELP_AND_FEEDBACK = 513;
+
     // ---- End O Constants, all O constants go above this line ----
 
     // Add new aosp constants above this line.