DesktopAura: Track windows "owned" via the DesktopWindowTreeHost

ui/views/widget/native_widget_mac.h

 // 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.
 
 #ifndef UI_VIEWS_WIDGET_NATIVE_WIDGET_MAC_H_
 #define UI_VIEWS_WIDGET_NATIVE_WIDGET_MAC_H_
 
 #include "base/macros.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/views/widget/native_widget_private.h"
@@ skipping 113 matching lines @@
       Widget::MoveLoopEscapeBehavior escape_behavior) override;
   void EndMoveLoop() override;
   void SetVisibilityChangedAnimationsEnabled(bool value) override;
   void SetVisibilityAnimationDuration(const base::TimeDelta& duration) override;
   void SetVisibilityAnimationTransition(
       Widget::VisibilityTransition transition) override;
   bool IsTranslucentWindowOpacitySupported() const override;
   void OnSizeConstraintsChanged() override;
   void RepostNativeEvent(gfx::NativeEvent native_event) override;
   std::string GetName() const override;
+  Widget::Widgets GetAllOwnedTopLevelWidgets() const override;
 
  protected:
   // Creates the NSWindow that will be passed to the BridgedNativeWidget.
   // Called by InitNativeWidget. The return value will be autoreleased.
   virtual NativeWidgetMacNSWindow* CreateNSWindow(
       const Widget::InitParams& params);
 
   internal::NativeWidgetDelegate* delegate() { return delegate_; }
 
  private:
   friend class test::MockNativeWidgetMac;
   friend class test::HitTestNativeWidgetMac;
 
   internal::NativeWidgetDelegate* delegate_;
   std::unique_ptr<BridgedNativeWidget> bridge_;
 
   Widget::InitParams::Ownership ownership_;
 
   // Internal name.
   std::string name_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeWidgetMac);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_NATIVE_WIDGET_MAC_H_