Prefer the exact match over prefix match for the password manager filling.

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 551dd8a99578f6160c6503d954d913c96816d4bd..2bd0b74c677a1149d6299ce3bc4473d25ed51408 100644
--- a/chrome/renderer/autofill/password_autofill_agent_browsertest.cc
+++ b/chrome/renderer/autofill/password_autofill_agent_browsertest.cc
@@ -68,6 +68,7 @@ const char kCreditCardVerificationName[] = "cvc";
 const char kAliceUsername[] = "alice";
 const char kAlicePassword[] = "password";
 const char kBobUsername[] = "bob";
+const char kBobAtUsername[] = "bob@example.com";
 const char kBobPassword[] = "secret";
 const char kCarolUsername[] = "Carol";
 const char kCarolPassword[] = "test";
@@ -283,6 +284,7 @@ class PasswordAutofillAgentTest : public ChromeRenderViewTest {
     password1_ = ASCIIToUTF16(kAlicePassword);
     username2_ = ASCIIToUTF16(kBobUsername);
     password2_ = ASCIIToUTF16(kBobPassword);
+    username2at_ = ASCIIToUTF16(kBobAtUsername);
     username3_ = ASCIIToUTF16(kCarolUsername);
     password3_ = ASCIIToUTF16(kCarolPassword);
     alternate_username3_ = ASCIIToUTF16(kCarolAlternateUsername);
@@ -304,6 +306,7 @@ class PasswordAutofillAgentTest : public ChromeRenderViewTest {
     PasswordAndRealm password3;
     password3.password = password3_;
     fill_data_.additional_logins[username3_] = password3;
+    fill_data_.additional_logins[username2at_] = password3;
 
     UsernamesCollectionKey key;
     key.username = username3_;
@@ -619,6 +622,7 @@ class PasswordAutofillAgentTest : public ChromeRenderViewTest {
 
   base::string16 username1_;
   base::string16 username2_;
+  base::string16 username2at_;
   base::string16 username3_;
   base::string16 password1_;
   base::string16 password2_;
@@ -764,6 +768,15 @@ TEST_F(
                        false);
 }
 
+// Tests that the exact match is always preferred.
+TEST_F(PasswordAutofillAgentTest, TestThatExactMatchIsPreffered) {
+  username_element_.SetValue(WebString::FromUTF16(username2at_));
+
+  SimulateOnFillPasswordForm(fill_data_);
+  CheckTextFieldsState(UTF16ToUTF8(username2at_), false,

[vabr (Chromium), 2017/06/23 06:58:11]

Yes, these two "false" should be "true" (we expect the fields to be marked as
autofilled). Sorry, I should have caught that yesterday.

+                       UTF16ToUTF8(password3_), false);
+}
+
 // If a username field is empty and readonly, don't autofill.
 TEST_F(PasswordAutofillAgentTest,
        NoAutocompletePasswordForReadonlyUsernameUnmatched) {