Update actions.xml with correct GTS Suggestion Tile metric.

R=yusufo@chromium.org

Bug: 985386
Change-Id: I2b9d7e702bc35f71af58903b3379dcfd761fc06b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1812094Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Matt Simmons <mattsimmons@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697877}

tools/metrics/actions/actions.xml

@@ -21483,6 +21483,15 @@ should be able to be added at any place in this file.
   </description>
 </action>
 
+<action name="Suggestions.Tile.Tapped.GridTabSwitcher">
+  <owner>mattsimmons@chromium.org</owner>
+  <owner>memex-team@google.com</owner>
+  <description>
+    User tapped on a suggestions tile while viewing the tab switcher.
+    Android-only.
+  </description>
+</action>
+
 <action name="SuspiciousExtensionBubbleDismissed">
   <owner>finnur@chromium.org</owner>
   <description>Please enter the description of this user action.</description>