Add "previewing on hover" support for password field.

components/password_manager/core/browser/password_autofill_manager_unittest.cc

Index: components/password_manager/core/browser/password_autofill_manager_unittest.cc
diff --git a/components/password_manager/core/browser/password_autofill_manager_unittest.cc b/components/password_manager/core/browser/password_autofill_manager_unittest.cc
index 19ba317c3b0e482ff9371cd311ac066578faefcc..d6aa76c00756ab36ea3b8b9c368ee39c3d221708 100644
--- a/components/password_manager/core/browser/password_autofill_manager_unittest.cc
+++ b/components/password_manager/core/browser/password_autofill_manager_unittest.cc
@@ -48,6 +48,9 @@ class MockPasswordManagerDriver
                void(const std::vector<autofill::FormData>&));
   MOCK_METHOD2(AcceptPasswordAutofillSuggestion,
                void(const base::string16&, const base::string16&));
+  MOCK_METHOD2(PreviewPasswordAutofillSuggestion,
+               void(const base::string16&, const base::string16&));
+  MOCK_METHOD0(ClearPasswordPreviewedForm, void());
   MOCK_METHOD0(GetPasswordAutofillManager,
                password_manager::PasswordAutofillManager*());
 };
@@ -160,6 +163,33 @@ TEST_F(PasswordAutofillManagerTest, AcceptSuggestion) {
       username_field_, test_username_));
 }
 
+TEST_F(PasswordAutofillManagerTest, SelectSuggestion) {
+  scoped_ptr<TestPasswordManagerClient> client(new TestPasswordManagerClient);
+  InitializePasswordAutofillManager(client.get(), NULL);
+
+  EXPECT_CALL(
+      *client->mock_driver(),
+      PreviewPasswordAutofillSuggestion(test_username_, test_password_));
+  EXPECT_TRUE(password_autofill_manager_->SelectSuggestionForTest(
+      username_field_, test_username_));
+  testing::Mock::VerifyAndClearExpectations(client->mock_driver());
+
+  EXPECT_CALL(*client->mock_driver(),
+              PreviewPasswordAutofillSuggestion(_, _)).Times(0);
+  EXPECT_FALSE(password_autofill_manager_->SelectSuggestionForTest(
+      username_field_, base::ASCIIToUTF16(kInvalidUsername)));
+
+  autofill::FormFieldData invalid_username_field;
+  invalid_username_field.name = base::ASCIIToUTF16(kInvalidUsername);
+
+  EXPECT_FALSE(password_autofill_manager_->SelectSuggestionForTest(
+      invalid_username_field, test_username_));
+
+  password_autofill_manager_->Reset();
+  EXPECT_FALSE(password_autofill_manager_->SelectSuggestionForTest(
+      username_field_, test_username_));
+}
+
 // Test that the popup is marked as visible after recieving password
 // suggestions.
 TEST_F(PasswordAutofillManagerTest, ExternalDelegatePasswordSuggestions) {