[Password Autofill] Trigger onChange events in JavaScript when autofilling passwords.

components/autofill/content/renderer/autofill_agent.h

Index: components/autofill/content/renderer/autofill_agent.h
diff --git a/components/autofill/content/renderer/autofill_agent.h b/components/autofill/content/renderer/autofill_agent.h
index a49224911a7bea8b6210b622152f8516a5b616f2..ded2b2995df968d934e5af3b541cec052e5cfc5b 100644
--- a/components/autofill/content/renderer/autofill_agent.h
+++ b/components/autofill/content/renderer/autofill_agent.h
@@ -231,6 +231,9 @@ class AutofillAgent : public content::RenderViewObserver,
   FRIEND_TEST_ALL_PREFIXES(PasswordAutofillAgentTest, WaitUsername);
   FRIEND_TEST_ALL_PREFIXES(PasswordAutofillAgentTest, SuggestionAccept);
   FRIEND_TEST_ALL_PREFIXES(PasswordAutofillAgentTest, SuggestionSelect);
+  FRIEND_TEST_ALL_PREFIXES(
+      PasswordAutofillAgentTest,
+      PasswordAutofillTriggersOnChangeEventsWaitForUsername);
 
   DISALLOW_COPY_AND_ASSIGN(AutofillAgent);
 };