Added Home, end, PageUp, PageDown support in the ChromeVox menu

chrome/browser/resources/chromeos/chromevox/cvox2/background/panel.js

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * @fileoverview The ChromeVox panel and menus.
  */
 
 goog.provide('Panel');
 
@@ skipping 425 matching lines @@
 
   this.activeMenu_ = menu;
   this.pendingCallback_ = null;
 
   if (this.activeMenu_) {
     this.activeMenu_.activate();
   }
 };
 
 /**
+ * Sets the index of the current active menu to be 0.
+ */
+Panel.scrollToTop = function() {
+  this.activeMenu_.scrollToTop();
+};
+
+/**
+ * Sets the index of the current active menu to be the last index.
+ */
+Panel.scrollToBottom = function() {
+  this.activeMenu_.scrollToBottom();
+};
+
+/**
  * Advance the index of the current active menu by |delta|.
  * @param {number} delta The number to add to the active menu index.
  */
 Panel.advanceActiveMenuBy = function(delta) {
   var activeIndex = -1;
   for (var i = 0; i < this.menus_.length; i++) {
     if (this.activeMenu_ == this.menus_[i]) {
       activeIndex = i;
       break;
     }
@@ skipping 67 matching lines @@
       break;
     case 'ArrowUp':
       Panel.advanceItemBy(-1);
       break;
     case 'ArrowDown':
       Panel.advanceItemBy(1);
       break;
     case 'Escape':
       Panel.closeMenusAndRestoreFocus();
       break;
+    case 'PageUp':
+      Panel.advanceItemBy(10);
+      break;
+    case 'PageDown':
+      Panel.advanceItemBy(-10);
+      break;
+    case 'Home':
+      Panel.scrollToTop();
+      break;
+    case 'End':
+      Panel.scrollToBottom();
+      break;
     case 'Enter':
     case ' ':  // Space
       Panel.pendingCallback_ = Panel.getCallbackForCurrentItem();
       Panel.closeMenusAndRestoreFocus();
       break;
     default:
       // Don't mark this event as handled.
       return;
   }
 
@@ skipping 105 matching lines @@
 }, false);
 
 window.addEventListener('hashchange', function() {
   if (location.hash == '#fullscreen' || location.hash == '#focus') {
     this.originalStickyState_ = cvox.ChromeVox.isStickyPrefOn;
     cvox.ChromeVox.isStickyPrefOn = false;
   } else {
     cvox.ChromeVox.isStickyPrefOn = this.originalStickyState_;
   }
 }, false);