Plumb native AppWindow input region through to window shape under Aura.

ui/views/widget/desktop_aura/desktop_root_window_host.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_ROOT_WINDOW_HOST_H_
 #define UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_ROOT_WINDOW_HOST_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "ui/aura/root_window.h"
 #include "ui/base/ui_base_types.h"
@@ skipping 75 matching lines @@
   virtual void SetSize(const gfx::Size& size) = 0;
   virtual void CenterWindow(const gfx::Size& size) = 0;
   virtual void GetWindowPlacement(gfx::Rect* bounds,
                                   ui::WindowShowState* show_state) const = 0;
   virtual gfx::Rect GetWindowBoundsInScreen() const = 0;
   virtual gfx::Rect GetClientAreaBoundsInScreen() const = 0;
   virtual gfx::Rect GetRestoredBounds() const = 0;
 
   virtual gfx::Rect GetWorkAreaBoundsInScreen() const = 0;
 
+  // Sets the shape of the root window. If |native_region| is NULL then the
+  // window reverts to rectangular. Takes ownership of |native_region|.
   virtual void SetShape(gfx::NativeRegion native_region) = 0;
 
   virtual void Activate() = 0;
   virtual void Deactivate() = 0;
   virtual bool IsActive() const = 0;
   virtual void Maximize() = 0;
   virtual void Minimize() = 0;
   virtual void Restore() = 0;
   virtual bool IsMaximized() const = 0;
   virtual bool IsMinimized() const = 0;
@@ skipping 39 matching lines @@
   virtual void OnNativeWidgetBlur() = 0;
 
   // Returns true if the Widget was closed but is still showing because of
   // animations.
   virtual bool IsAnimatingClosed() const = 0;
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_ROOT_WINDOW_HOST_H_