DesktopAura: Track windows "owned" via the DesktopWindowTreeHost

ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h

 // 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.
 
 #ifndef UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_WINDOW_TREE_HOST_X11_H_
 #define UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_WINDOW_TREE_HOST_X11_H_
 
 #include <stddef.h>
 #include <stdint.h>
 #include <X11/extensions/shape.h>
@@ skipping 138 matching lines @@
   void SetOpacity(float opacity) override;
   void SetWindowIcons(const gfx::ImageSkia& window_icon,
                       const gfx::ImageSkia& app_icon) override;
   void InitModalType(ui::ModalType modal_type) override;
   void FlashFrame(bool flash_frame) override;
   bool IsAnimatingClosed() const override;
   bool IsTranslucentWindowOpacitySupported() const override;
   void SizeConstraintsChanged() override;
   bool ShouldUpdateWindowTransparency() const override;
   bool ShouldUseDesktopNativeCursorManager() const override;
+  std::vector<DesktopWindowTreeHost*> GetOwnedTopLevelHosts() const override;
 
   // Overridden from aura::WindowTreeHost:
   gfx::Transform GetRootTransform() const override;
   ui::EventSource* GetEventSource() override;
   gfx::AcceleratedWidget GetAcceleratedWidget() override;
   void ShowImpl() override;
   void HideImpl() override;
   gfx::Rect GetBoundsInPixels() const override;
   void SetBoundsInPixels(const gfx::Rect& requested_bounds_in_pixels) override;
   gfx::Point GetLocationOnScreenInPixels() const override;
@@ skipping 264 matching lines @@
 
   base::WeakPtrFactory<DesktopWindowTreeHostX11> close_widget_factory_;
   base::WeakPtrFactory<DesktopWindowTreeHostX11> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DesktopWindowTreeHostX11);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_WINDOW_TREE_HOST_X11_H_