Maybe add a test like
```
TEST_P(PasswordManagerTest, SavingBlockedByTrustedVaultErrorMetric) {
base::test::ScopedFeatureList feature_list;
feature_list.InitAndEnableFeature(
password_manager::features::kPasswordSaveInContextErrorResolution);
// Setup error on the appropriate store.
if (ShouldEnableAccountStorage()) {
syncer::TestSyncService sync_service;
sync_service.GetUserSettings()->SetSelectedTypes(
/*sync_everything=*/false, {syncer::UserSelectableType::kPasswords});
ON_CALL(client_, GetSyncService()).WillByDefault(Return(&sync_service));
account_store_->SetError(ActionableError::kTrustedVaultKeyNeeded);
} else {
store_->SetError(ActionableError::kTrustedVaultKeyNeeded);
}
PasswordForm form(MakeSimpleForm());
store_->AddLogin(password_manager::FromPasswordForm(form));
FormData observed_form = form.form_data;
manager()->OnPasswordFormsParsed(&driver_, {observed_form});
manager()->OnPasswordFormsRendered(&driver_, {observed_form});
task_environment_.RunUntilIdle();
manager()->OnPasswordFormSubmitted(&driver_, observed_form);
base::HistogramTester histogram_tester;
EXPECT_CALL(client_, IsSavingAndFillingEnabled).WillRepeatedly(Return(true));
manager()->OnPasswordFormsRendered(&driver_, {});
task_environment_.RunUntilIdle();
histogram_tester.ExpectUniqueSample(
"PasswordManager.AbleToSavePasswordsOnSuccessfulLogin", false, 1);
histogram_tester.ExpectUniqueSample(
"PasswordManager.SavingBlockedByTrustedVaultErrorOnSuccessfulLogin", true,
1);
}
```