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,

[Peter Lundblad, 2015/11/20 11:15:03]

FWIW, the file is consistently wrong when it comes to these annotations.
The question mark means nullable, but the prose talks about undefined.
Feel free to ignore in this cl, but we should clean it up.
Also, the question mark would be redundant for an object.

[dmazzoni, 2015/11/20 23:35:15]

Acknowledged.

+ *     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',