Implement automatic load of composed/embedded automation trees

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 fb851690585913880b3ba70de3c1a2f1ea4dbd09..85d2e4047fd52a64ebb1fef75eafae3140983041 100644
--- a/chrome/renderer/resources/extensions/automation/automation_node.js
+++ b/chrome/renderer/resources/extensions/automation/automation_node.js
@@ -14,6 +14,14 @@ var schema = requireNative('automationInternal').GetSchemaAdditions();
 var utils = require('utils');
 
 /**
+ * Maps an id in the form:
+ *     <process_id>_<routing_id>
+ *     to an AutomationNode with role type webArea.
+ * @type {!Object.<string, string>}
+ */
+var idToWebArea_ = {};
+
+/**
  * A single node in the Automation tree.
  * @param {AutomationRootNodeImpl} root The root of the tree.
  * @constructor
@@ -34,24 +42,29 @@ AutomationNodeImpl.prototype = {
   role: '',
   state: { busy: true },
   isRootNode: false,
+  loaded: false,
 
   get root() {
     return this.rootImpl.wrapper;
   },
 
   parent: function() {
+    if (this.role == schema.RoleType.rootWebArea) {
+      var parentId = this.processID + '_' + this.routingID;
+      if (idToWebArea_[parentId])
+        return idToWebArea_[parentId];
+    }
     return this.rootImpl.get(this.parentID);
   },
 
   firstChild: function() {
-    var node = this.rootImpl.get(this.childIds[0]);
-    return node;
+    return this.lookupWebAreaChild_() || this.rootImpl.get(this.childIds[0]);
   },
 
   lastChild: function() {
     var childIds = this.childIds;
-    var node = this.rootImpl.get(childIds[childIds.length - 1]);
-    return node;
+    return this.lookupWebAreaChild_() ||
+        this.rootImpl.get(childIds[childIds.length - 1]);
   },
 
   children: function() {
@@ -113,6 +126,19 @@ AutomationNodeImpl.prototype = {
     }
   },
 
+  load: function(callback) {
+    if (this.role != schema.RoleType.webArea)
+      throw 'Unsupported state: can only load webArea nodes.';
+
+    if (!this.loaded)
+      automationInternal.enableRenderer(this.processID, this.routingID);
+
+    automationUtil.onTreeLoaded(this.processID, this.routingID, function(root) {
+      if (callback)
+        callback(root);
+    }.bind(this));
+  },
+
   dispatchEvent: function(eventType) {
     var path = [];
     var parent = this.parent();
@@ -144,6 +170,14 @@ AutomationNodeImpl.prototype = {
         ' attributes=' + $JSON.stringify(this.attributes);
   },
 
+  lookupWebAreaChild_: function() {
+    if (this.role != schema.RoleType.webArea)
+      return null;
+
+    return automationUtil.idToAutomationRootNode[
+      automationUtil.createAutomationRootNodeID(this.processID, this.routingID)];
+  },
+
   dispatchEventAtCapturing_: function(event, path) {
     privates(event).impl.eventPhase = Event.CAPTURING_PHASE;
     for (var i = path.length - 1; i >= 0; i--) {
@@ -353,6 +387,9 @@ AutomationRootNodeImpl.prototype = {
   destroy: function() {
     this.dispatchEvent(schema.EventType.destroyed);
     this.invalidate_(this.wrapper);
+    idToWebArea_[this.processID +
+        '_' +
+        this.routingID] = undefined;
   },
 
   onAccessibilityEvent: function(eventParams) {
@@ -406,19 +443,10 @@ AutomationRootNodeImpl.prototype = {
       nodeImpl[key] = AutomationAttributeDefaults[key];
     }
     nodeImpl.childIds = [];
-    nodeImpl.loaded = false;
     nodeImpl.id = id;
     delete this.axNodeDataCache_[id];
   },
 
-  load: function(callback) {
-    // TODO(dtseng/aboxhall): Implement.
-    if (!this.loaded)
-      throw 'Unsupported state: root node is not loaded.';
-
-    setTimeout(callback, 0);
-  },
-
   deleteOldChildren_: function(node, newChildIds) {
     // Create a set of child ids in |src| for fast lookup, and return false
     // if a duplicate is found;
@@ -495,6 +523,16 @@ AutomationRootNodeImpl.prototype = {
 
   setData_: function(node, nodeData) {
     var nodeImpl = privates(node).impl;
+
+    if (nodeData.role == schema.RoleType.webArea) {
+      nodeImpl.processID = nodeData.intAttributes.processId;
+      nodeImpl.routingID = nodeData.intAttributes.routingId;
+      idToWebArea_[nodeImpl.processID +
+          '_' +
+          nodeImpl.routingID] = node;
+      delete nodeData.intAttributes['processId'];
+      delete nodeData.intAttributes['routingId'];
+    }
     for (var key in AutomationAttributeDefaults) {
       if (key in nodeData)
         nodeImpl[key] = nodeData[key];
@@ -599,19 +637,20 @@ var AutomationNode = utils.expose('AutomationNode',
                                                 'makeVisible',
                                                 'setSelection',
                                                 'addEventListener',
-                                                'removeEventListener'],
+                                                'removeEventListener',
+                                                'load'],
                                     readonly: ['isRootNode',
                                                'role',
                                                'state',
                                                'location',
                                                'attributes',
+                                               'loaded',
                                                'root'] });
 
 var AutomationRootNode = utils.expose('AutomationRootNode',
                                       AutomationRootNodeImpl,
                                       { superclass: AutomationNode,
-                                        functions: ['load'],
-                                        readonly: ['loaded'] });
+                                        functions: ['load'] });
 
 exports.AutomationNode = AutomationNode;
 exports.AutomationRootNode = AutomationRootNode;