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

ui/views/accessibility/native_view_accessibility.h

 // Copyright (c) 2013 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.
 
 #ifndef UI_VIEWS_ACCESSIBILITY_NATIVE_VIEW_ACCESSIBILITY_H_
 #define UI_VIEWS_ACCESSIBILITY_NATIVE_VIEW_ACCESSIBILITY_H_
 
 #include "base/macros.h"
 #include "build/build_config.h"
 #include "ui/accessibility/ax_node_data.h"
@@ skipping 27 matching lines @@
   static NativeViewAccessibility* Create(View* view);
 
   gfx::NativeViewAccessible GetNativeObject();
 
   // Call Destroy rather than deleting this, because the subclass may
   // use reference counting.
   virtual void Destroy();
 
   void NotifyAccessibilityEvent(ui::AXEvent event_type);
 
-  // ui::AXPlatformNodeDelegate
+  // ui::AXPlatformNodeDelegate:
   const ui::AXNodeData& GetData() override;
   int GetChildCount() override;
   gfx::NativeViewAccessible ChildAtIndex(int index) override;
   gfx::NativeWindow GetTopLevelWidget() override;
   gfx::NativeViewAccessible GetParent() override;
   gfx::Vector2d GetGlobalCoordinateOffset() override;
   gfx::NativeViewAccessible HitTestSync(int x, int y) override;
   gfx::NativeViewAccessible GetFocus() override;
   gfx::AcceleratedWidget GetTargetForNativeAccessibilityEvent() override;
   void DoDefaultAction() override;
   bool SetStringValue(const base::string16& new_value) override;
   bool CanSetStringValue() override;
+  bool IsIgnored() override;
 
-  // WidgetObserver
+  // WidgetObserver:
   void OnWidgetDestroying(Widget* widget) override;
 
   Widget* parent_widget() const { return parent_widget_; }
   void SetParentWidget(Widget* parent_widget);
 
+  // Whether the accessibility element has any unignored children.
+  bool IsLeafElement();
+
  protected:
   NativeViewAccessibility(View* view);
   ~NativeViewAccessibility() override;
 
   // Weak. Owns this.
   View* view_;
 
   // Weak. Uses WidgetObserver to clear. This is set on the root view for
   // a widget that's owned by another widget, so we can walk back up the
   // tree.
   Widget* parent_widget_;
 
  private:
   void PopulateChildWidgetVector(std::vector<Widget*>* result_child_widgets);
 
   // We own this, but it is reference-counted on some platforms so we can't use
   // a scoped_ptr. It is dereferenced in the destructor.
   ui::AXPlatformNode* ax_node_;
 
   ui::AXNodeData data_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeViewAccessibility);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_ACCESSIBILITY_NATIVE_VIEW_ACCESSIBILITY_H_