Track all changed nodes during an update

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 291 matching lines @@
   callback QueryCallback = void(AutomationNode node);
 
   // An event in the Automation tree.
   [nocompile, noinline_doc] dictionary AutomationEvent {
     // The $(ref:automation.AutomationNode) to which the event was targeted.
     AutomationNode target;
 
     // The type of the event.
     EventType type;
 
+    // The source of this event.
+    DOMString eventFrom;
+
     // Stops this event from further processing except for any remaining
     // listeners on $(ref:AutomationEvent.target).
     static void stopPropagation();
   };
 
   // A listener for events on an <code>AutomationNode</code>.
   callback AutomationListener = void(AutomationEvent event);
 
   // A change to the Automation tree.
   [nocompile, noinline_doc] dictionary TreeChange {
@@ skipping 326 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);
   };
 };