Don't paint the throbber animation while dragging.

chrome/browser/gtk/tabs/tab_strip_gtk.cc

Index: chrome/browser/gtk/tabs/tab_strip_gtk.cc
diff --git a/chrome/browser/gtk/tabs/tab_strip_gtk.cc b/chrome/browser/gtk/tabs/tab_strip_gtk.cc
index 01be3db457ab2e0873cc2fc8bc9293fe5ca0010f..d01d5b15cde6a30782e6f2ceba0620bcbb909f66 100644
--- a/chrome/browser/gtk/tabs/tab_strip_gtk.cc
+++ b/chrome/browser/gtk/tabs/tab_strip_gtk.cc
@@ -1786,7 +1786,8 @@ gboolean TabStripGtk::OnExpose(GtkWidget* widget, GdkEventExpose* event,
   gdk_region_get_rectangles(event->region, &rects, &num_rects);
   qsort(rects, num_rects, sizeof(GdkRectangle), CompareGdkRectangles);
   std::vector<int> tabs_to_repaint;
-  if (tabstrip->CanPaintOnlyFavIcons(rects, num_rects, &tabs_to_repaint)) {
+  if (!tabstrip->IsDragSessionActive() &&
+      tabstrip->CanPaintOnlyFavIcons(rects, num_rects, &tabs_to_repaint)) {
     tabstrip->PaintOnlyFavIcons(event, tabs_to_repaint);
     g_free(rects);
     return TRUE;