[SyncSetup]: Add user action when the user navigates to Sync advanced.

This CL records a user action when the user navigates to
chrome://settings/syncSetup/Advanced. This metric is needed for sync
setup friendly settings.

Bug: 1050070
Change-Id: I6206807fd8038385f8cd9d8b9fe1d7e0077c9a6a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2096441Reviewed-by: Esmael Elmoslimany <aee@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Commit-Queue: Monica Basta <msalama@chromium.org>
Cr-Commit-Position: refs/heads/master@{#749189}

chrome/browser/resources/settings/people_page/sync_controls.js

@@ -39,7 +39,7 @@ const RadioButtonNames = {
 Polymer({
   is: 'settings-sync-controls',
 
-  behaviors: [WebUIListenerBehavior],
+  behaviors: [WebUIListenerBehavior, settings.RouteObserverBehavior],
 
   properties: {
     hidden: {
@@ -103,6 +103,14 @@ Polymer({
     }
   },
 
+  /** @protected */
+  currentRouteChanged() {
+    const router = settings.Router.getInstance();
+    if (router.getCurrentRoute() === router.getRoutes().SYNC_ADVANCED) {
+      chrome.metricsPrivate.recordUserAction('Sync_NavigateToSyncAdvancedPage');
+    }
+  },
+
   /**
    * Handler for when the sync preferences are updated.
    * @private

tools/metrics/actions/actions.xml

@@ -22560,7 +22560,16 @@ should be able to be added at any place in this file.
   <owner>chrome-signin-team@google.com</owner>
   <description>
     The user selected to customize sync from
-    |chrome://settings/syncSetup/advanced|.
+    chrome://settings/syncSetup/advanced.
+  </description>
+</action>
+
+<action name="Sync_NavigateToSyncAdvancedPage">
+  <owner>msalama@chromium.org</owner>
+  <owner>chrome-signin-team@google.com</owner>
+  <description>
+    The user has navigated to the sync advanced settings page
+    chrome://settings/syncSetup/advanced.
   </description>
 </action>
 
@@ -22568,8 +22577,8 @@ should be able to be added at any place in this file.
   <owner>msalama@chromium.org</owner>
   <owner>chrome-signin-team@google.com</owner>
   <description>
-    The user has clicked on the history usage row in
-    |chrome://settings/syncSetup| to open Activity controls page.
+    The user has clicked on the history usage row in chrome://settings/syncSetup
+    to open Activity controls page.
   </description>
 </action>
 
@@ -22577,8 +22586,7 @@ should be able to be added at any place in this file.
   <owner>msalama@chromium.org</owner>
   <owner>chrome-signin-team@google.com</owner>
   <description>
-    The user selected sync everything from
-    |chrome://settings/syncSetup/advanced|.
+    The user selected sync everything from chrome://settings/syncSetup/advanced.
   </description>
 </action>