Suppress the autofill password manager after a credential was saved via the API.

chrome/browser/password_manager/credential_manager_browsertest.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 "base/macros.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/password_manager/password_manager_test_base.h"
 #include "chrome/browser/password_manager/password_store_factory.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
@@ skipping 104 matching lines @@
   NavigationObserver observer(WebContents());
   observer.SetPathToWaitFor("/password/done.html");
   observer.Wait();
 
   std::unique_ptr<PromptObserver> prompt_observer(
       PromptObserver::Create(WebContents()));
   // The autofill password manager shouldn't react to the successful login.
   EXPECT_FALSE(prompt_observer->IsShowingPrompt());
 }
 
+IN_PROC_BROWSER_TEST_F(CredentialManagerBrowserTest, SaveViaAPIAndAutofill) {
+  NavigateToFile("/password/password_form.html");
+  std::string fill_password =
+  "document.getElementById('username_field').value = 'user';"
+  "document.getElementById('password_field').value = '12345';";
+  ASSERT_TRUE(content::ExecuteScript(RenderViewHost(), fill_password));
+
+  // Call the API to save the form.
+  ASSERT_TRUE(content::ExecuteScript(
+      RenderViewHost(),
+      "var c = new PasswordCredential({ id: 'user', password: '12345' });"
+      "navigator.credentials.store(c);"));
+  std::unique_ptr<PromptObserver> prompt_observer(
+      PromptObserver::Create(WebContents()));
+  EXPECT_TRUE(prompt_observer->IsShowingPrompt());
+  prompt_observer->Dismiss();
+
+  NavigationObserver form_submit_observer(WebContents());
+  ASSERT_TRUE(content::ExecuteScript(
+      RenderViewHost(),
+      "document.getElementById('input_submit_button').click();"));
+  form_submit_observer.Wait();
+  EXPECT_FALSE(prompt_observer->IsShowingPrompt());
+}
+
 }  // namespace