[GTK] Stash new dimensions on resize, so that the backing store can use them

webkit/tools/test_shell/webwidget_host.h

Index: webkit/tools/test_shell/webwidget_host.h
diff --git a/webkit/tools/test_shell/webwidget_host.h b/webkit/tools/test_shell/webwidget_host.h
index 49c0ba798483468ae11a407d896d3c68768f4c3f..cb9dee75f9076ed8edec1ee9d220b3e897524570 100644
--- a/webkit/tools/test_shell/webwidget_host.h
+++ b/webkit/tools/test_shell/webwidget_host.h
@@ -132,6 +132,11 @@ class WebWidgetHost {
   int scroll_dy_;
 
   bool track_mouse_leave_;
+#if defined(OS_LINUX)
+  // Since GtkWindow resize is asynchronous, we have to stash the dimensions,
+  // so that the backing store doesn't have to wait for sizing to take place.
+  gfx::Size logical_size_;
+#endif
 
 #ifndef NDEBUG
   bool painting_;