MD Settings: Add remaining buttons to keyboard subpage

chrome/browser/resources/settings/device_page/device_page_browser_proxy.js

Index: chrome/browser/resources/settings/device_page/device_page_browser_proxy.js
diff --git a/chrome/browser/resources/settings/device_page/device_page_browser_proxy.js b/chrome/browser/resources/settings/device_page/device_page_browser_proxy.js
index 058bf19b141c5f2c41bb3012348669510ff14b56..ad9077dd51feeb1ffdf82743bf413acdac350f90 100644
--- a/chrome/browser/resources/settings/device_page/device_page_browser_proxy.js
+++ b/chrome/browser/resources/settings/device_page/device_page_browser_proxy.js
@@ -14,6 +14,12 @@ cr.define('settings', function() {
      * @param {!Event} e
      */
     handleLinkEvent: function(e) {},
+
+    /** Initializes the keyboard WebUI handler. */
+    initializeKeyboard: function() {},
+
+    /** Shows the Ash keyboard shortcuts overlay. */
+    showKeyboardShortcutsOverlay: function() {},
   };
 
   /**
@@ -31,6 +37,16 @@ cr.define('settings', function() {
       if (e.type != 'keydown' || e.keyCode == 13)
         e.stopPropagation();
     },
+
+    /** @override */
+    initializeKeyboard: function() {
+      chrome.send('initializeKeyboardSettings');
+    },
+
+    /** @override */
+    showKeyboardShortcutsOverlay: function() {
+      chrome.send('showKeyboardShortcutsOverlay');
+    },
   };
 
   return {