BrowserAccessibility should own a AXPlatformNode.

content/browser/accessibility/browser_accessibility.cc

 // Copyright (c) 2012 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.
 
 #include "content/browser/accessibility/browser_accessibility.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 
@@ skipping 19 matching lines @@
 }
 
 #if !defined(PLATFORM_HAS_NATIVE_ACCESSIBILITY_IMPL)
 // static
 BrowserAccessibility* BrowserAccessibility::Create() {
   return new BrowserAccessibility();
 }
 #endif
 
 BrowserAccessibility::BrowserAccessibility()
-    : manager_(NULL),
-      node_(NULL),
-      unique_id_(ui::GetNextAXPlatformNodeUniqueId()) {
+    : manager_(nullptr),
+      node_(nullptr),
+      unique_id_(ui::GetNextAXPlatformNodeUniqueId()),
+      platform_node_(nullptr) {
   g_unique_id_map.Get()[unique_id_] = this;
 }
 
 BrowserAccessibility::~BrowserAccessibility() {
   if (unique_id_)
     g_unique_id_map.Get().erase(unique_id_);
+  if (platform_node_)
+    platform_node_->Destroy();
 }
 
 // static
 BrowserAccessibility* BrowserAccessibility::GetFromUniqueID(int32_t unique_id) {
   auto iter = g_unique_id_map.Get().find(unique_id);
   if (iter == g_unique_id_map.Get().end())
     return nullptr;
 
   return iter->second;
 }
 
 void BrowserAccessibility::Init(BrowserAccessibilityManager* manager,
     ui::AXNode* node) {
   manager_ = manager;
   node_ = node;
+
+// Here we create the AXPlatformNode which contains a platform-specific
+// implementation of requried accessibility APIS for this node. At this point,
+// we only are creating this object for Windows. See http://crbug.com/703369
+#if defined(OS_WIN)
+  platform_node_ = ui::AXPlatformNode::Create(this);
+#endif
 }
 
 bool BrowserAccessibility::PlatformIsLeaf() const {
   if (InternalChildCount() == 0)
     return true;
 
   // These types of objects may have children that we use as internal
   // implementation details, but we want to expose them as leaves to platform
   // accessibility APIs because screen readers might be confused if they find
   // any children.
@@ skipping 1195 matching lines @@
     const ui::AXActionData& data) {
   NOTREACHED();
   return false;
 }
 
 void BrowserAccessibility::DoDefaultAction() {
   NOTREACHED();
 }
 
 }  // namespace content