cros: Arrow key traversal in views.

chrome/browser/resources/chromeos/login/network_dropdown.js

Index: chrome/browser/resources/chromeos/login/network_dropdown.js
diff --git a/chrome/browser/resources/chromeos/login/network_dropdown.js b/chrome/browser/resources/chromeos/login/network_dropdown.js
index cda221dd881b457baad64739185bbd232f4f25e0..0e429cd5a9125dac671edaf463cd7e234391a547 100644
--- a/chrome/browser/resources/chromeos/login/network_dropdown.js
+++ b/chrome/browser/resources/chromeos/login/network_dropdown.js
@@ -294,6 +294,8 @@ cr.define('cr.ui', function() {
              e.keyCode == DropDown.KEYCODE_DOWN)) {
           this.opening = true;
           this.controller.isShown = true;
+          e.stopPropagation();
+          e.preventDefault();
         }
       });
       return el;
@@ -308,6 +310,7 @@ cr.define('cr.ui', function() {
       if (!this.isShown)
         return;
       var selected = this.container.selectedItem;
+      var handled = false;
       switch (e.keyCode) {
         case DropDown.KEYCODE_UP: {
           do {
@@ -316,6 +319,7 @@ cr.define('cr.ui', function() {
               selected = this.container.lastElementChild;
           } while (selected.iid < 0);
           this.container.selectItem(selected, false);
+          handled = true;
           break;
         }
         case DropDown.KEYCODE_DOWN: {
@@ -325,14 +329,17 @@ cr.define('cr.ui', function() {
               selected = this.container.firstItem;
           } while (selected.iid < 0);
           this.container.selectItem(selected, false);
+          handled = true;
           break;
         }
         case DropDown.KEYCODE_ESC: {
           this.isShown = false;
+          handled = true;
           break;
         }
         case DropDown.KEYCODE_TAB: {
           this.isShown = false;
+          handled = true;
           break;
         }
         case DropDown.KEYCODE_ENTER: {
@@ -344,9 +351,14 @@ cr.define('cr.ui', function() {
             if (item.iid >= 0 && !item.classList.contains('disabled-item'))
               chrome.send('networkItemChosen', [item.iid]);
           }
+          handled = true;
           break;
         }
       }
+      if (handled) {
+        e.stopPropagation();
+        e.preventDefault();
+      }
       this.title_.opening = false;
     }
   };