Update browser cache of accessibility tree on renderer sub-tree changes....

chrome/browser/browser_accessibility_win.cc

Index: chrome/browser/browser_accessibility_win.cc
===================================================================
--- chrome/browser/browser_accessibility_win.cc	(revision 57122)
+++ chrome/browser/browser_accessibility_win.cc	(working copy)
@@ -55,6 +55,9 @@
 }
 
 void BrowserAccessibility::InactivateTree() {
+  if (!instance_active_)
+    return;
+
   // Mark this object as inactive, so calls to all COM methods will return
   // failure.
   instance_active_ = false;
@@ -70,6 +73,7 @@
     (*iter)->Release();
   }
   children_.clear();
+  manager_->Remove(child_id_);
 }
 
 bool BrowserAccessibility::IsDescendantOf(BrowserAccessibility* ancestor) {
@@ -82,6 +86,10 @@
   return false;
 }
 
+BrowserAccessibility* BrowserAccessibility::GetParent() {
+  return parent_;
+}
+
 BrowserAccessibility* BrowserAccessibility::GetPreviousSibling() {
   if (parent_ && index_in_parent_ > 0)
     return parent_->children_[index_in_parent_ - 1];
@@ -98,6 +106,14 @@
   return NULL;
 }
 
+void BrowserAccessibility::ReplaceChild(
+    const BrowserAccessibility* old_acc, BrowserAccessibility* new_acc) {
+  DCHECK_EQ(children_[old_acc->index_in_parent_], old_acc);
+
+  old_acc = children_[old_acc->index_in_parent_];
+  children_[old_acc->index_in_parent_] = new_acc;
+}
+
 BrowserAccessibility* BrowserAccessibility::NewReference() {
   AddRef();
   return this;