[Autofill] Give the PasswordAutofillAgent first shot at handling mouse events.

components/autofill/renderer/autofill_agent.cc

Index: components/autofill/renderer/autofill_agent.cc
diff --git a/components/autofill/renderer/autofill_agent.cc b/components/autofill/renderer/autofill_agent.cc
index 462b1b6b8026122286cfe14177790005cc4ba037..f32896b2e8693463d7216224ca6acb9a779ae97e 100644
--- a/components/autofill/renderer/autofill_agent.cc
+++ b/components/autofill/renderer/autofill_agent.cc
@@ -802,6 +802,8 @@ void AutofillAgent::ShowSuggestions(const WebInputElement& element,
   }
 
   element_ = element;
+  if (password_autofill_agent_->ShowSuggestions(element))
+    return;
 
   // If autocomplete is disabled at the form level, then we might want to show a
   // warning in place of suggestions.  However, if autocomplete is disabled