Stop prerendering of a site if it uses the Credential Manager API.

chrome/browser/password_manager/chrome_password_manager_client.cc

Index: chrome/browser/password_manager/chrome_password_manager_client.cc
diff --git a/chrome/browser/password_manager/chrome_password_manager_client.cc b/chrome/browser/password_manager/chrome_password_manager_client.cc
index 402754cfafaa5169b6b0499bdebcd0554eef99d8..5f89c71eeba493a862e75a32b971b25c4a9c4eb0 100644
--- a/chrome/browser/password_manager/chrome_password_manager_client.cc
+++ b/chrome/browser/password_manager/chrome_password_manager_client.cc
@@ -17,6 +17,7 @@
 #include "chrome/browser/browsing_data/browsing_data_helper.h"
 #include "chrome/browser/metrics/chrome_metrics_service_accessor.h"
 #include "chrome/browser/password_manager/password_store_factory.h"
+#include "chrome/browser/prerender/prerender_contents.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/signin/signin_manager_factory.h"
 #include "chrome/browser/sync/profile_sync_service_factory.h"
@@ -212,6 +213,16 @@ bool ChromePasswordManagerClient::IsFillingEnabledForCurrentPage() const {
          IsPasswordManagementEnabledForCurrentPage();
 }
 
+bool ChromePasswordManagerClient::OnCredentialManagerUsed() {
+  prerender::PrerenderContents* prerender_contents =
+      prerender::PrerenderContents::FromWebContents(web_contents());
+  if (prerender_contents) {
+    prerender_contents->Destroy(prerender::FINAL_STATUS_CREDENTIAL_MANAGER_API);
+    return false;
+  }
+  return true;
+}
+
 bool ChromePasswordManagerClient::PromptUserToSaveOrUpdatePassword(
     std::unique_ptr<password_manager::PasswordFormManager> form_to_save,
     password_manager::CredentialSourceType type,