Add metric for clicks on gesture education notification

Bug: 1056451
Change-Id: I667692eb3dd172921fec09cf93f66e33cd0a7024
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2099475Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Commit-Queue: Ahmed Mehfooz <amehfooz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#750896}

chrome/browser/ui/ash/system_tray_client.cc

@@ -277,6 +277,7 @@ void SystemTrayClient::ShowAccessibilitySettings() {
 void SystemTrayClient::ShowGestureEducationHelp() {
   chrome::ScopedTabbedBrowserDisplayer displayer(
       ProfileManager::GetActiveUserProfile());
+  base::RecordAction(base::UserMetricsAction("ShowGestureEducationHelp"));
   ShowSingletonTab(displayer.browser(),
                    GURL(chrome::kChromeOSGestureEducationHelpURL));
 }

tools/metrics/actions/actions.xml

@@ -19521,6 +19521,15 @@ should be able to be added at any place in this file.
   </description>
 </action>
 
+<action name="ShowGestureEducationHelp">
+  <owner>amehfooz@chromium.org</owner>
+  <owner>tengs@chromium.org</owner>
+  <description>
+    The user opened the gesture education help from the notification shown to
+    highlight new gestures in tablet mode.
+  </description>
+</action>
+
 <action name="ShowHelpTab">
   <owner>Please list the metric's owners. Add more owner tags as needed.</owner>
   <description>Please enter the description of this user action.</description>