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

ui/views/widget/desktop_aura/desktop_root_window_host_win.cc

 // 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.
 
 #include "ui/views/widget/desktop_aura/desktop_root_window_host_win.h"
 
 #include "base/win/metro.h"
 #include "third_party/skia/include/core/SkPath.h"
 #include "third_party/skia/include/core/SkRegion.h"
 #include "ui/aura/client/aura_constants.h"
@@ skipping 218 matching lines @@
   MONITORINFO monitor_info;
   monitor_info.cbSize = sizeof(monitor_info);
   GetMonitorInfo(MonitorFromWindow(message_handler_->hwnd(),
                                    MONITOR_DEFAULTTONEAREST),
                  &monitor_info);
   gfx::Rect pixel_bounds = gfx::Rect(monitor_info.rcWork);
   return gfx::win::ScreenToDIPRect(pixel_bounds);
 }
 
 void DesktopRootWindowHostWin::SetShape(gfx::NativeRegion native_region) {
-  SkPath path;
-  native_region->getBoundaryPath(&path);
-  message_handler_->SetRegion(gfx::CreateHRGNFromSkPath(path));
+  if (native_region) {
+    SkPath path;
+    native_region->getBoundaryPath(&path);
+    message_handler_->SetRegion(gfx::CreateHRGNFromSkPath(path));
+  } else {
+    message_handler_->SetRegion(NULL);
+  }
+
+  delete native_region;
 }
 
 void DesktopRootWindowHostWin::Activate() {
   message_handler_->Activate();
 }
 
 void DesktopRootWindowHostWin::Deactivate() {
   message_handler_->Deactivate();
 }
 
@@ skipping 652 matching lines @@
 
 // static
 DesktopRootWindowHost* DesktopRootWindowHost::Create(
     internal::NativeWidgetDelegate* native_widget_delegate,
     DesktopNativeWidgetAura* desktop_native_widget_aura) {
   return new DesktopRootWindowHostWin(native_widget_delegate,
                                       desktop_native_widget_aura);
 }
 
 }  // namespace views