Finish implementing ChromeVox Next active indicator.

chrome/renderer/resources/extensions/automation/automation_node.js

Index: chrome/renderer/resources/extensions/automation/automation_node.js
diff --git a/chrome/renderer/resources/extensions/automation/automation_node.js b/chrome/renderer/resources/extensions/automation/automation_node.js
index d6eac9203939c4456967da3a50f14dbb51e32ea7..4e3a2d46900fcad1faf5589692d76ff59a975fe3 100644
--- a/chrome/renderer/resources/extensions/automation/automation_node.js
+++ b/chrome/renderer/resources/extensions/automation/automation_node.js
@@ -124,6 +124,17 @@ var GetLocation = requireNative('automationInternal').GetLocation;
 /**
  * @param {number} axTreeID The id of the accessibility tree.
  * @param {number} nodeID The id of a node.
+ * @param {number} startIndex The start index of the range.
+ * @param {number} endIndex The end index of the range.
+ * @return {?automation.Rect} The bounding box of the subrange of this node,
+ *     or the location if there are no subranges, or undefined if
+ *     the tree or node wasn't found.
+ */
+var GetBoundsForRange = requireNative('automationInternal').GetBoundsForRange;
+
+/**
+ * @param {number} axTreeID The id of the accessibility tree.
+ * @param {number} nodeID The id of a node.
  * @param {string} attr The name of a string attribute.
  * @return {?string} The value of this attribute, or undefined if the tree,
  *     node, or attribute wasn't found.
@@ -222,6 +233,10 @@ AutomationNodeImpl.prototype = {
     return GetLocation(this.treeID, this.id);
   },
 
+  boundsForRange: function(startIndex, endIndex) {
+    return GetBoundsForRange(this.treeID, this.id, startIndex, endIndex);
+  },
+
   get indexInParent() {
     return GetIndexInParent(this.treeID, this.id);
   },
@@ -935,7 +950,8 @@ var AutomationNode = utils.expose('AutomationNode',
                                                 'addEventListener',
                                                 'removeEventListener',
                                                 'domQuerySelector',
-                                                'toString' ],
+                                                'toString',
+                                                'boundsForRange'],
                                     readonly: publicAttributes.concat(
                                               ['parent',
                                                'firstChild',