Prune invisible views from the desktop automation tree

ui/views/accessibility/ax_widget_obj_wrapper.cc

 // 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.
 
 #include "ui/views/accessibility/ax_widget_obj_wrapper.h"
 
 #include "ui/accessibility/ax_node_data.h"
 #include "ui/views/accessibility/ax_aura_obj_cache.h"
 #include "ui/views/accessibility/ax_aura_obj_wrapper.h"
 #include "ui/views/widget/widget.h"
@@ skipping 12 matching lines @@
   }
   widget_ = NULL;
 }
 
 AXAuraObjWrapper* AXWidgetObjWrapper::GetParent() {
   return AXAuraObjCache::GetInstance()->GetOrCreate(widget_->GetNativeView());
 }
 
 void AXWidgetObjWrapper::GetChildren(
     std::vector<AXAuraObjWrapper*>* out_children) {
+  if (!widget_->IsVisible() || !widget_->GetRootView()->visible())
+    return;
+
   out_children->push_back(
       AXAuraObjCache::GetInstance()->GetOrCreate(widget_->GetRootView()));
 }
 
 void AXWidgetObjWrapper::Serialize(ui::AXNodeData* out_node_data) {
   out_node_data->id = GetID();
   out_node_data->role = ui::AX_ROLE_CLIENT;
   out_node_data->location = widget_->GetWindowBoundsInScreen();
   // TODO(dtseng): Set better states.
   out_node_data->state = 0;
 }
 
 int32_t AXWidgetObjWrapper::GetID() {
   return AXAuraObjCache::GetInstance()->GetID(widget_);
 }
 
 void AXWidgetObjWrapper::OnWidgetDestroying(Widget* widget) {
   AXAuraObjCache::GetInstance()->Remove(widget);
 }
 
 void AXWidgetObjWrapper::OnWillRemoveView(Widget* widget, View* view) {
   AXAuraObjCache::GetInstance()->RemoveViewSubtree(view);
 }
 
 }  // namespace views