MD Settings; Proposal on how to restore focus after subpage exiting.

chrome/browser/resources/settings/passwords_and_forms_page/passwords_and_forms_page.js

Index: chrome/browser/resources/settings/passwords_and_forms_page/passwords_and_forms_page.js
diff --git a/chrome/browser/resources/settings/passwords_and_forms_page/passwords_and_forms_page.js b/chrome/browser/resources/settings/passwords_and_forms_page/passwords_and_forms_page.js
index 0598f0298e8f8515b7fc4ba993b5e115a4c9521c..1b0befe89ec72461f4459a85ffd7d1d71a23e1bf 100644
--- a/chrome/browser/resources/settings/passwords_and_forms_page/passwords_and_forms_page.js
+++ b/chrome/browser/resources/settings/passwords_and_forms_page/passwords_and_forms_page.js
@@ -5,13 +5,15 @@
 Polymer({
   is: 'settings-passwords-and-forms-page',
 
-  behaviors: [PrefsBehavior],
+  behaviors: [PrefsBehavior, settings.RouteObserverBehavior],
 
   properties: {
     /** @private Filter applied to passwords and password exceptions. */
     passwordFilter_: String,
   },
 
+  lastOldRoute_: null,
+
   /**
    * Shows the manage autofill sub page.
    * @param {!Event} event
@@ -29,4 +31,24 @@ Polymer({
   onPasswordsTap_: function(event) {
     settings.navigateTo(settings.Route.MANAGE_PASSWORDS);
   },
+
+  currentRouteChanged: function(newRoute, oldRoute) {
+    this.lastOldRoute_ = oldRoute;
+
+    // neon-animatable has "display: none" until the animation finishes, so
+    // calling focus() on any of its children has no effect until
+    // "display: none" is removed. Using 'iron-select' listener which fires
+    // after the animation has finished allows focus() to work as expected.
+  },
+
+  onIronSelect_: function(e) {
+    if (e.detail.item != this.$$('neon-animatable'))
+      return;
+
+    var route = this.lastOldRoute_;
+    if (route == settings.Route.AUTOFILL)
+      this.$$('#autofillManagerButton .subpage-arrow').focus();
+    if (route == settings.Route.MANAGE_PASSWORDS)
+      this.$$('#passwordManagerButton .subpage-arrow').focus();
+  },
 });