make menus, bubbles, etc. top level windows on aura

ui/views/widget/desktop_aura/desktop_root_window_host_win.h

Index: ui/views/widget/desktop_aura/desktop_root_window_host_win.h
diff --git a/ui/views/widget/desktop_aura/desktop_root_window_host_win.h b/ui/views/widget/desktop_aura/desktop_root_window_host_win.h
index 0ef05d57fee3960b19d1905ff74cc32de3e8bcf6..1b85a4484ff05dbbad43b81327089beee3134a34 100644
--- a/ui/views/widget/desktop_aura/desktop_root_window_host_win.h
+++ b/ui/views/widget/desktop_aura/desktop_root_window_host_win.h
@@ -47,6 +47,7 @@ class VIEWS_EXPORT DesktopRootWindowHostWin
   // Overridden from DesktopRootWindowHost:
   virtual aura::RootWindow* Init(aura::Window* content_window,
                                  const Widget::InitParams& params) OVERRIDE;
+  virtual void InitFocus(aura::Window* window) OVERRIDE;
   virtual void Close() OVERRIDE;
   virtual void CloseNow() OVERRIDE;
   virtual aura::RootWindowHost* AsRootWindowHost() OVERRIDE;
@@ -124,6 +125,7 @@ class VIEWS_EXPORT DesktopRootWindowHostWin
   virtual void PostNativeEvent(const base::NativeEvent& native_event) OVERRIDE;
   virtual void OnDeviceScaleFactorChanged(float device_scale_factor) OVERRIDE;
   virtual void PrepareForShutdown() OVERRIDE;
+  virtual void SetHostWindowExpansion(const gfx::Rect& extra) OVERRIDE;
 
   // Overridden from HWNDMessageHandlerDelegate:
   virtual bool IsWidgetWindow() const OVERRIDE;
@@ -234,6 +236,12 @@ class VIEWS_EXPORT DesktopRootWindowHostWin
 
   scoped_ptr<DesktopDragDropClientWin> drag_drop_client_;
 
+  // Extra size added to the host window. Typically, the window size matches
+  // the contained content, however, when performing a translating or scaling
+  // animation the window has to be enlarged so that the content is not
+  // clipped.
+  gfx::Rect window_expansion_;
+
   DISALLOW_COPY_AND_ASSIGN(DesktopRootWindowHostWin);
 };