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..79aefb83112da46ed99d17acadcd8847640bffe4 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::IsCredentialManagerEnabledForCurrentPage() {

[pasko, 2016/10/26 12:37:00]

Naming this function by starting with "Is" suggests that it has limited side
effects, which is confusing. Can it be renamed to something like
KillCurrentPageIfPrerendered()? Then it would probably be better to return true
iff the page is killed.

[vasilii, 2016/10/27 09:02:08]

Renamed. The password manager is a component. It shouldn't know any information
about prerendering and its consequences.

+  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,