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

chrome/browser/ui/views/apps/native_app_window_views.cc

Index: chrome/browser/ui/views/apps/native_app_window_views.cc
diff --git a/chrome/browser/ui/views/apps/native_app_window_views.cc b/chrome/browser/ui/views/apps/native_app_window_views.cc
index 9b3950f0c950cbcbb101c15d700534335ed86be8..4bad172cc08693f134f82d9aad05c09698cebe54 100644
--- a/chrome/browser/ui/views/apps/native_app_window_views.cc
+++ b/chrome/browser/ui/views/apps/native_app_window_views.cc
@@ -843,6 +843,13 @@ SkRegion* NativeAppWindowViews::GetDraggableRegion() {
 
 void NativeAppWindowViews::UpdateInputRegion(scoped_ptr<SkRegion> region) {
   input_region_ = region.Pass();
+
+#if defined(USE_AURA)
+  if (input_region_)
+    window_->SetShape(new SkRegion(*input_region_));
+  else
+    window_->SetShape(NULL);
+#endif // defined(USE_AURA)
 }
 
 void NativeAppWindowViews::HandleKeyboardEvent(