Test for the autofill login for the form without username field.

chrome/renderer/autofill/password_autofill_agent_browsertest.cc

Index: chrome/renderer/autofill/password_autofill_agent_browsertest.cc
diff --git a/chrome/renderer/autofill/password_autofill_agent_browsertest.cc b/chrome/renderer/autofill/password_autofill_agent_browsertest.cc
index 15619b6161c35330fd4c4d9d1c56be7506e3b61d..e09e2892dca80f0ad9beac77b2df78dc65604a49 100644
--- a/chrome/renderer/autofill/password_autofill_agent_browsertest.cc
+++ b/chrome/renderer/autofill/password_autofill_agent_browsertest.cc
@@ -727,6 +727,20 @@ TEST_F(PasswordAutofillAgentTest,
   CheckTextFieldsState(std::string(), false, std::string(), false);
 }
 
+// If there is no username field and the saved credentials contain an empty
+// username, then the password is filled.
+TEST_F(PasswordAutofillAgentTest, AutocompletePasswordForNoUsername) {
+  // Load a form with no username and update test data.
+  LoadHTML(kVisibleFormWithNoUsernameHTML);
+  UpdateOnlyPasswordElement();
+  UpdateOriginForHTML(kVisibleFormWithNoUsernameHTML);
+
+  SimulateOnFillPasswordForm(fill_data_);

[vabr (Chromium), 2017/06/19 13:03:36]

Instead of fill_data_, you might need to make a copy and clear its
username_field. Also, password_for_empty_username_ does not seem defined, so
probably just use the password_field.value from the modified FillData.

+  EXPECT_TRUE(password_element_.IsAutofilled());
+  EXPECT_EQ(UTF16ToUTF8(password_for_empty_username_),
+            password_element_.Value().Utf8());
+}
+
 // Tests that having a non-matching username precludes the autocomplete.
 TEST_F(PasswordAutofillAgentTest, NoAutocompleteForFilledFieldUnmatched) {
   username_element_.SetValue(WebString::FromUTF8("bogus"));