MD Settings: Restore focus after exiting various subpages.

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

Index: chrome/browser/resources/settings/people_page/people_page.js
diff --git a/chrome/browser/resources/settings/people_page/people_page.js b/chrome/browser/resources/settings/people_page/people_page.js
index c53125e22c6338ccee18e2474c35fc4faee8f7f0..e222cc4e363346d6b76dd80e248cdb1bcfec6c97 100644
--- a/chrome/browser/resources/settings/people_page/people_page.js
+++ b/chrome/browser/resources/settings/people_page/people_page.js
@@ -145,6 +145,32 @@ Polymer({
       value: false,
     },
 // </if>
+
+    /** @private {!Map<string, string>} */
+    focusConfig_: {
+      type: Object,
+      value: function() {
+        var map = new Map();
+        map.set(
+            settings.Route.SYNC.path, '#sync-status .subpage-arrow');
+// <if expr="not chromeos">
+        map.set(
+            settings.Route.MANAGE_PROFILE.path,
+            '#picture-subpage-trigger .subpage-arrow');
+// </if>
+// <if expr="chromeos">
+        map.set(
+            settings.Route.CHANGE_PICTURE.path,
+            '#picture-subpage-trigger .subpage-arrow');
+        map.set(
+            settings.Route.LOCK_SCREEN.path, '#lockScreenSubpageTrigger');
+        map.set(
+            settings.Route.ACCOUNTS.path,
+            '#manage-other-people-subpage-trigger .subpage-arrow');
+// </if>
+        return map;
+      },
+    },
   },
 
   /** @override */