a11y: Exclude children of nested keyboard accessible controls from a11y tree.

ui/views/view.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.
 
 #define _USE_MATH_DEFINES // For VC++ to get M_PI. This has to be first.
 
 #include "ui/views/view.h"
 
 #include <algorithm>
 #include <cmath>
@@ skipping 1321 matching lines @@
 }
 
 // Accessibility----------------------------------------------------------------
 
 bool View::HandleAccessibleAction(const ui::AXActionData& action_data) {
   return false;
 }
 
 gfx::NativeViewAccessible View::GetNativeViewAccessible() {
   if (!native_view_accessibility_)
-    native_view_accessibility_ = NativeViewAccessibility::Create(this);
+    native_view_accessibility_ = NativeViewAccessibility::GetOrCreate(this);
   if (native_view_accessibility_)
     return native_view_accessibility_->GetNativeObject();
-  return NULL;
+  return nullptr;
 }
 
 void View::NotifyAccessibilityEvent(
     ui::AXEvent event_type,
     bool send_native_event) {
   if (ViewsDelegate::GetInstance())
     ViewsDelegate::GetInstance()->NotifyAccessibilityEvent(this, event_type);
 
   if (send_native_event && GetWidget()) {
     if (!native_view_accessibility_)
-      native_view_accessibility_ = NativeViewAccessibility::Create(this);
+      native_view_accessibility_ = NativeViewAccessibility::GetOrCreate(this);
     if (native_view_accessibility_)
       native_view_accessibility_->NotifyAccessibilityEvent(event_type);
   }
 }
 
 // Scrolling -------------------------------------------------------------------
 
 void View::ScrollRectToVisible(const gfx::Rect& rect) {
   // We must take RTL UI mirroring into account when adjusting the position of
   // the region.
@@ skipping 1081 matching lines @@
   // Message the RootView to do the drag and drop. That way if we're removed
   // the RootView can detect it and avoid calling us back.
   gfx::Point widget_location(event.location());
   ConvertPointToWidget(this, &widget_location);
   widget->RunShellDrag(this, data, widget_location, drag_operations, source);
   // WARNING: we may have been deleted.
   return true;
 }
 
 }  // namespace views