Implemented ARIA colindex, rowindex, colcount and rowcount for 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 534 matching lines @@
     // The 1-based index of an item in a set.
     long? posInSet;
 
     // The number of items in a set;
     long? setSize;
 
     //
     // Table attributes.
     //
 
-    // The number of rows in this table.
+    // The number of rows in this table as specified in the DOM.
     long? tableRowCount;
 
-    // The number of columns in this table.
+    // The number of rows in this table as specified by the page author.
+    long? ariaRowCount;
+
+    // The number of columns in this table as specified in the DOM.
     long? tableColumnCount;
 
+    // The number of columns in this table as specified by the page author.
+    long? ariaColumnCount;
+
     //
     // Table cell attributes.
     //
 
-    // The zero-based index of the column that this cell is in.
+    // The zero-based index of the column that this cell is in as specified in the DOM.

[michaelpg, 2017/04/06 14:52:05]

nit: wrap line at 80 chars

     long? tableCellColumnIndex;
 
+    // The ARIA column index as specified by the page author.
+    long? ariaCellColumnIndex;
+
     // The number of columns that this cell spans (default is 1).
     long? tableCellColumnSpan;
 
-    // The zero-based index of the row that this cell is in.
+    // The zero-based index of the row that this cell is in as specified in the DOM.

[michaelpg, 2017/04/06 14:52:05]

nit: wrap line at 80 chars

     long? tableCellRowIndex;
 
+    // The ARIA row index as specified by the page author.
+    long? ariaCellRowIndex;
+
     // The number of rows that this cell spans (default is 1).
     long? tableCellRowSpan;
 
     // The corresponding column header for this cell.
     AutomationNode? tableColumnHeader;
 
     // The corresponding row header for this cell.
     AutomationNode? tableRowHeader;
 
     //
@@ skipping 205 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);
   };
 };