Don't preview autofill/autocomplete until first real mouse move.

chrome/browser/ui/views/autofill/autofill_popup_base_view.cc

Index: chrome/browser/ui/views/autofill/autofill_popup_base_view.cc
diff --git a/chrome/browser/ui/views/autofill/autofill_popup_base_view.cc b/chrome/browser/ui/views/autofill/autofill_popup_base_view.cc
index 2c73a69060a54a7c8fd0566853b7be93189b3b70..f131ae5ac10c028962d9ea777a85c6dd28a7464e 100644
--- a/chrome/browser/ui/views/autofill/autofill_popup_base_view.cc
+++ b/chrome/browser/ui/views/autofill/autofill_popup_base_view.cc
@@ -143,6 +143,11 @@ void AutofillPopupBaseView::OnMouseExited(const ui::MouseEvent& event) {
 }
 
 void AutofillPopupBaseView::OnMouseMoved(const ui::MouseEvent& event) {
+  // A synthesized mouse move will be sent when the popup is first shown.
+  // Don't preview a suggestion if the mouse happens to be hovering there.
+  if (event.flags() & ui::EF_IS_SYNTHESIZED)
+    return;
+
   if (HitTestPoint(event.location()))
     SetSelection(event.location());
   else