Add separate UMA histograms for the account chooser with 1/many accounts.

chrome/browser/ui/passwords/password_dialog_controller_impl_unittest.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/passwords/password_dialog_controller_impl.h"
 
 #include <memory>
 #include <utility>
 #include <vector>
 
@@ skipping 103 matching lines @@
   EXPECT_CALL(prompt, ControllerGone());
   EXPECT_CALL(ui_controller_mock(), ChooseCredential(
       local_form,
       password_manager::CredentialType::CREDENTIAL_TYPE_PASSWORD));
   controller().OnChooseCredentials(
       *local_form_ptr,
       password_manager::CredentialType::CREDENTIAL_TYPE_PASSWORD);
   histogram_tester.ExpectUniqueSample(
       "PasswordManager.AccountChooserDialog",
        password_manager::metrics_util::ACCOUNT_CHOOSER_CREDENTIAL_CHOSEN, 1);
+  histogram_tester.ExpectUniqueSample(
+      "PasswordManager.AccountChooserDialogMultipleAccounts",
+       password_manager::metrics_util::ACCOUNT_CHOOSER_CREDENTIAL_CHOSEN, 1);
+  histogram_tester.ExpectTotalCount(
+      "PasswordManager.AccountChooserDialogOneAccount", 0);
 }
 
 TEST_F(PasswordDialogControllerTest, ShowAccountChooserAndSignIn) {
   base::HistogramTester histogram_tester;
   StrictMock<MockPasswordPrompt> prompt;
   autofill::PasswordForm local_form = GetLocalForm();
   std::vector<std::unique_ptr<autofill::PasswordForm>> locals;
   locals.push_back(base::WrapUnique(new autofill::PasswordForm(local_form)));
   std::vector<std::unique_ptr<autofill::PasswordForm>> federations;
 
   EXPECT_CALL(prompt, ShowAccountChooser());
   controller().ShowAccountChooser(&prompt,
                                   std::move(locals), std::move(federations));
   EXPECT_THAT(controller().GetLocalForms(), ElementsAre(Pointee(local_form)));
   EXPECT_THAT(controller().GetFederationsForms(), testing::IsEmpty());
   EXPECT_TRUE(controller().ShouldShowSignInButton());
 
   // Close the dialog.
   EXPECT_CALL(prompt, ControllerGone());
   EXPECT_CALL(ui_controller_mock(), ChooseCredential(
       local_form,
       password_manager::CredentialType::CREDENTIAL_TYPE_PASSWORD));
   controller().OnSignInClicked();
   histogram_tester.ExpectUniqueSample(
       "PasswordManager.AccountChooserDialog",
        password_manager::metrics_util::ACCOUNT_CHOOSER_SIGN_IN, 1);
+  histogram_tester.ExpectUniqueSample(
+      "PasswordManager.AccountChooserDialogOneAccount",
+       password_manager::metrics_util::ACCOUNT_CHOOSER_SIGN_IN, 1);
+  histogram_tester.ExpectTotalCount(
+      "PasswordManager.AccountChooserDialogMultipleAccounts", 0);
 }
 
 TEST_F(PasswordDialogControllerTest, AccountChooserClosed) {
   base::HistogramTester histogram_tester;
   StrictMock<MockPasswordPrompt> prompt;
+  std::vector<std::unique_ptr<autofill::PasswordForm>> locals;
+  locals.push_back(
+      base::WrapUnique(new autofill::PasswordForm(GetLocalForm())));
   EXPECT_CALL(prompt, ShowAccountChooser());
-  controller().ShowAccountChooser(&prompt,
-                                  PasswordDialogController::FormsVector(),
+  controller().ShowAccountChooser(&prompt, std::move(locals),
                                   PasswordDialogController::FormsVector());
 
   EXPECT_CALL(ui_controller_mock(), OnDialogHidden());
   controller().OnCloseDialog();
   histogram_tester.ExpectUniqueSample(
       "PasswordManager.AccountChooserDialog",
        password_manager::metrics_util::ACCOUNT_CHOOSER_DISMISSED, 1);
+  histogram_tester.ExpectUniqueSample(
+      "PasswordManager.AccountChooserDialogOneAccount",
+       password_manager::metrics_util::ACCOUNT_CHOOSER_DISMISSED, 1);
+  histogram_tester.ExpectTotalCount(
+      "PasswordManager.AccountChooserDialogMultipleAccounts", 0);
 }
 
 TEST_F(PasswordDialogControllerTest, AutoSigninPromo) {
   base::HistogramTester histogram_tester;
   StrictMock<MockPasswordPrompt> prompt;
   EXPECT_CALL(prompt, ShowAutoSigninPrompt());
   controller().ShowAutosigninPrompt(&prompt);
 
   prefs()->SetBoolean(
       password_manager::prefs::kWasAutoSignInFirstRunExperienceShown, false);
@@ skipping 52 matching lines @@
       "PasswordManager.AutoSigninFirstRunDialog",
        password_manager::metrics_util::AUTO_SIGNIN_TURN_OFF, 1);
 }
 
 TEST_F(PasswordDialogControllerTest, OnBrandLinkClicked) {
   EXPECT_CALL(ui_controller_mock(), NavigateToSmartLockHelpPage());
   controller().OnSmartLockLinkClicked();
 }
 
 }  // namespace