Support role description in automation/ChromeVox

chrome/common/extensions/api/automation.idl

 // Copyright 2014 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.
 
 // The <code>chrome.automation</code> API allows developers to access the
 // automation (accessibility) tree for the browser. The tree resembles the DOM
 // tree, but only exposes the <em>semantic</em> structure of a page. It can be
 // used to programmatically interact with a page by examining names, roles, and
 // states, listening for events, and performing actions on nodes.
 [nocompile] namespace automation {
@@ skipping 380 matching lines @@
     // is not available. The start and end indices are zero-based offsets
     // into the node's "name" string attribute.
     static Rect boundsForRange(long startIndex, long endIndex);
 
     // The purpose of the node, other than the role, if any.
     DOMString? description;
 
     // The placeholder for this text field, if any.
     DOMString? placeholder;
 
+    // The role description for this node.
+    DOMString? roleDescription;
+
     // The accessible name for this node, via the
     // <a href="http://www.w3.org/TR/wai-aria/roles#namecalculation">
     // Accessible Name Calculation</a> process.
     DOMString? name;
 
     // The source of the name.
     NameFromType? nameFrom;
 
     // The value for this node: for example the <code>value</code> attribute of
     // an <code>&lt;input&gt; element.
@@ skipping 393 matching lines @@
     // Everything in the tree between the two node/offset pairs gets included
     // in the selection. The anchor is where the user started the selection,
     // while the focus is the point at which the selection gets extended
     // e.g. when dragging with a mouse or using the keyboard. For nodes with
     // the role staticText, the offset gives the character offset within
     // the value where the selection starts or ends, respectively.
     [nocompile] static void setDocumentSelection(
         SetDocumentSelectionParams params);
   };
 };