Fix problems correctly invalidating/repainting when our updated paint rect fo...

chrome/browser/renderer_host/render_widget_host_view_gtk.h

Index: chrome/browser/renderer_host/render_widget_host_view_gtk.h
===================================================================
--- chrome/browser/renderer_host/render_widget_host_view_gtk.h	(revision 13668)
+++ chrome/browser/renderer_host/render_widget_host_view_gtk.h	(working copy)
@@ -101,6 +101,12 @@
   // activatable popup: <select> dropdown. Example of non-activatable popup:
   // form autocomplete.
   bool activatable_;
+  // This is true when we are currently painting and thus should handle extra
+  // paint requests by expanding the invalid rect rather than actually
+  // painting.
+  bool about_to_validate_and_paint_;
+  // This is the rectangle which we'll paint.
+  gfx::Rect invalid_rect_;
 
   // Whether we are currently loading.
   bool is_loading_;