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..bab41bdef70b189cd772b26ef482ca20ac944efd 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
@@ -40,18 +48,22 @@ AutomationNodeImpl.prototype = {
   },
 
   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() {
@@ -118,7 +130,6 @@ AutomationNodeImpl.prototype = {
     var parent = this.parent();
     while (parent) {
       path.push(parent);
-      // TODO(aboxhall/dtseng): handle unloaded parent node
       parent = parent.parent();
     }
     var event = new AutomationEvent(eventType, this.wrapper);
@@ -144,6 +155,15 @@ 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--) {
@@ -292,6 +312,8 @@ AutomationRootNodeImpl.prototype = {
 
   isRootNode: true,
 
+  loaded: false,
+
   get: function(id) {
     if (id == undefined)
       return undefined;
@@ -353,6 +375,8 @@ AutomationRootNodeImpl.prototype = {
   destroy: function() {
     this.dispatchEvent(schema.EventType.destroyed);
     this.invalidate_(this.wrapper);
+    idToWebArea_[automationUtil.createAutomationRootNodeID(this.processID,
+        this.routingID)] = undefined;
   },
 
   onAccessibilityEvent: function(eventParams) {
@@ -406,19 +430,10 @@ 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;
@@ -490,11 +505,31 @@ AutomationRootNodeImpl.prototype = {
       privates(childNode).impl.parentID = privates(node).impl.id;
     }
 
+    if (node.role == schema.RoleType.webArea && node.children().length == 0) {
+      var pid = node.processID;
+      var rid = node.attributes.routingID;
+      var id = automationUtil.createAutomationRootNodeID(pid, rid);
+      var targetTree = automationUtil.idToAutomationRootNode[id];
+      if (!targetTree)
+        targetTree = new AutomationRootNode(pid, rid);
+      automationUtil.idToAutomationRootNode[id] = targetTree;
+    }
+
     return success;
   },
 
   setData_: function(node, nodeData) {
     var nodeImpl = privates(node).impl;
+
+    if (nodeData.role == schema.RoleType.webArea) {
+      nodeImpl.processID = nodeData.intAttributes.frameId;
+      nodeImpl.routingID = nodeData.intAttributes.childFrameId;
+      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];
@@ -541,6 +576,18 @@ AutomationRootNodeImpl.prototype = {
     });
   },
 
+  load: function(callback) {
+    if (!this.loaded)
+      automationInternal.enableFrame(this.processID, this.routingID);
+
+    automationUtil.storeTreeCallback(this.processID, this.routingID,
+        function(root) {
+          privates(root).impl.loaded = true;
+          if (callback)
+            callback(root);
+        });
+  },
+
   updateNode_: function(nodeData, updateState) {
     var node = this.axNodeDataCache_[nodeData.id];
     var didUpdateRoot = false;
@@ -599,7 +646,8 @@ var AutomationNode = utils.expose('AutomationNode',
                                                 'makeVisible',
                                                 'setSelection',
                                                 'addEventListener',
-                                                'removeEventListener'],
+                                                'removeEventListener',
+                                                'load'],
                                     readonly: ['isRootNode',
                                                'role',
                                                'state',