Reimplement automation API on top of C++-backed AXTree.

chrome/common/extensions/api/automation_internal.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.
 
 // This is the implementation layer of the chrome.automation API, and is
 // essentially a translation of the internal accessibility tree update system
 // into an extension API.
 namespace automationInternal {
-  dictionary Rect {
-    long left;
-    long top;
-    long width;
-    long height;
-  };
-
-  // A compact representation of the accessibility information for a
-  // single web object, in a form that can be serialized and sent from
-  // one process to another.
-  // See ui/accessibility/ax_node_data.h
-  dictionary AXNodeData {
-    long id;
-    DOMString role;
-    object state;
-    Rect location;
-
-    object? boolAttributes;
-    object? floatAttributes;
-    object? htmlAttributes;
-    object? intAttributes;
-    object? intlistAttributes;
-    object? stringAttributes;
-    long[] childIds;
-  };
-
-  dictionary AXTreeUpdate {
-    // ID of the node, if any, which should be invalidated before the new data
-    // is applied.
-    long nodeIdToClear;
-
-    // A vector of nodes to update according to the rules described in
-    // ui/accessibility/ax_tree_update.h.
-    AXNodeData[] nodes;
-  };
-
   // Data for an accessibility event and/or an atomic change to an accessibility
   // tree. See ui/accessibility/ax_tree_update.h for an extended explanation of
   // the tree update format.
-  dictionary AXEventParams {
+  [nocompile] dictionary AXEventParams {
     // The tree id of the web contents that this update is for.
     long treeID;
 
     // ID of the node that the event applies to.
     long targetID;
 
     // The type of event that this update represents.
     DOMString eventType;
-
-    // Serialized changes to the tree structure and node data that should be
-    // applied before processing the event.
-    AXTreeUpdate update;
   };
 
   // All possible actions that can be performed on automation nodes.
   enum ActionType {
     focus,
     doDefault,
     makeVisible,
     setSelection,
     showContextMenu
   };
@@ skipping 55 matching lines @@
     // Performs a query selector query.
     static void querySelector(QuerySelectorRequiredParams args,
                               QuerySelectorCallback callback);
   };
 
   interface Events {
     // Fired when an accessibility event occurs
     static void onAccessibilityEvent(AXEventParams update);
 
     static void onAccessibilityTreeDestroyed(long treeID);
+
+    static void onTreeChange(long treeID, long nodeID, DOMString changeType);
   };
 };