MD Settings: Restore focus after exiting various subpages.

chrome/browser/resources/settings/languages_page/languages_page.js

Index: chrome/browser/resources/settings/languages_page/languages_page.js
diff --git a/chrome/browser/resources/settings/languages_page/languages_page.js b/chrome/browser/resources/settings/languages_page/languages_page.js
index f5b0f3b12ac9dbc9b06c07694085ad95b3d73332..8ae83c26af93e049af3079ad02e3168776dd2c75 100644
--- a/chrome/browser/resources/settings/languages_page/languages_page.js
+++ b/chrome/browser/resources/settings/languages_page/languages_page.js
@@ -58,6 +58,24 @@ Polymer({
 
     /** @private */
     showAddLanguagesDialog_: Boolean,
+
+    /** @private {?Map<string, string>} */
+    focusConfig_: Object,
+  },
+
+  /** @override */
+  ready: function() {
+    this.focusConfig_ = new Map();
+// <if expr="not is_macosx">

[Dan Beam, 2017/04/11 02:23:56]

fwiw: these will eventually get reformatted with `git cl format --js` to be
indented with the code

+    this.focusConfig_.set(
+        settings.Route.EDIT_DICTIONARY.path,
+        '#spellCheckCollapse .subpage-arrow');
+// </if>
+// <if expr="chromeos">
+    this.focusConfig_.set(
+        settings.Route.INPUT_METHODS.path,
+        '#inputMethodsCollapse .subpage-arrow');
+// </if>
   },
 
   /**