Ash/aura split: NativeWidgetAura::GetWindowScreenBounds() should return screen bounds.

ui/aura/root_window.cc

Index: ui/aura/root_window.cc
diff --git a/ui/aura/root_window.cc b/ui/aura/root_window.cc
index d443d622df499b4dc3711c74ee421e65158cb584..5fe70da8f69eda6b121d0f1133e2193492c69761 100644
--- a/ui/aura/root_window.cc
+++ b/ui/aura/root_window.cc
@@ -166,6 +166,10 @@ void RootWindow::SetHostBounds(const gfx::Rect& bounds) {
   synthesize_mouse_move_ = false;
 }
 
+gfx::Point RootWindow::GetHostOrigin() const {
+  return host_->GetBounds().origin();
+}
+
 void RootWindow::SetCursor(gfx::NativeCursor cursor) {
   last_cursor_ = cursor;
   // A lot of code seems to depend on NULL cursors actually showing an arrow,