chromeos: Add Power device page to chrome://md-settings.

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

Index: chrome/browser/resources/settings/device_page/device_page.js
diff --git a/chrome/browser/resources/settings/device_page/device_page.js b/chrome/browser/resources/settings/device_page/device_page.js
index 18f39843cb4200b4926ae776c14a8424fdc261eb..46439057a9987b0bd1178c9fe35d00c44d5d37e5 100644
--- a/chrome/browser/resources/settings/device_page/device_page.js
+++ b/chrome/browser/resources/settings/device_page/device_page.js
@@ -117,6 +117,14 @@ Polymer({
   },
 
   /**
+   * Handler for tapping the Power settings menu item.
+   * @private
+   */
+  onPowerTap_: function() {
+    settings.navigateTo(settings.Route.POWER);
+  },
+
+  /**
    * Handler for tapping the Storage settings menu item.
    * @private
    */