[fenix] For https://github.com/mozilla-mobile/fenix/issues/5094: Adds telemetry for show search shortcuts

app/metrics.yaml

@@ -111,7 +111,7 @@ events:
       preference_key:
         description: "The preference key for the switch preference the user toggled. We currently track:
           show_search_suggestions, remote_debugging, telemetry, tracking_protection, search_bookmarks,
-          search_browsing_history, and show_clipboard_suggestions"
+          search_browsing_history, show_clipboard_suggestions, and show_search_shortcuts"
       enabled:
         description: "Whether or not the preference is *now* enabled"
     bugs:
@@ -120,6 +120,7 @@ events:
     data_reviews:
     - https://github.com/mozilla-mobile/fenix/pull/1896
     - https://github.com/mozilla-mobile/fenix/pull/5704
+    - https://github.com/mozilla-mobile/fenix/pull/5886
     notification_emails:
     - fenix-core@mozilla.com
     expires: "2020-03-01"

app/src/main/java/org/mozilla/fenix/components/metrics/Metrics.kt

@@ -137,7 +137,8 @@ sealed class Event {
             context.getString(R.string.pref_key_tracking_protection),
             context.getString(R.string.pref_key_search_bookmarks),
             context.getString(R.string.pref_key_search_browsing_history),
-            context.getString(R.string.pref_key_show_clipboard_suggestions)
+            context.getString(R.string.pref_key_show_clipboard_suggestions),
+            context.getString(R.string.pref_key_show_search_shortcuts)
         )
 
         override val extras: Map<Events.preferenceToggledKeys, String>?