Revert of Remove OneClickSigninHelper since it is no longer used.

chrome/browser/ui/sync/one_click_signin_helper.cc

Index: chrome/browser/ui/sync/one_click_signin_helper.cc
diff --git a/chrome/browser/ui/sync/one_click_signin_helper.cc b/chrome/browser/ui/sync/one_click_signin_helper.cc
new file mode 100644
index 0000000000000000000000000000000000000000..e72ae55f591a9048e5015fb0c38375171019e666
--- /dev/null
+++ b/chrome/browser/ui/sync/one_click_signin_helper.cc
@@ -0,0 +1,1433 @@
+// Copyright (c) 2012 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/sync/one_click_signin_helper.h"
+
+#include <algorithm>
+#include <functional>
+#include <utility>
+#include <vector>
+
+#include "base/bind.h"
+#include "base/callback_forward.h"
+#include "base/callback_helpers.h"
+#include "base/compiler_specific.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/message_loop/message_loop_proxy.h"
+#include "base/metrics/field_trial.h"
+#include "base/metrics/histogram.h"
+#include "base/prefs/pref_service.h"
+#include "base/prefs/scoped_user_pref_update.h"
+#include "base/strings/string_split.h"
+#include "base/strings/string_util.h"
+#include "base/strings/utf_string_conversions.h"
+#include "base/supports_user_data.h"
+#include "base/values.h"
+#include "chrome/browser/browser_process.h"
+#include "chrome/browser/chrome_notification_types.h"
+#include "chrome/browser/defaults.h"
+#include "chrome/browser/history/history_service.h"
+#include "chrome/browser/history/history_service_factory.h"
+#include "chrome/browser/password_manager/chrome_password_manager_client.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/profiles/profile_info_cache.h"
+#include "chrome/browser/profiles/profile_io_data.h"
+#include "chrome/browser/profiles/profile_manager.h"
+#include "chrome/browser/search/search.h"
+#include "chrome/browser/signin/chrome_signin_client.h"
+#include "chrome/browser/signin/chrome_signin_client_factory.h"
+#include "chrome/browser/signin/signin_error_controller_factory.h"
+#include "chrome/browser/signin/signin_manager_factory.h"
+#include "chrome/browser/signin/signin_names_io_thread.h"
+#include "chrome/browser/sync/profile_sync_service.h"
+#include "chrome/browser/sync/profile_sync_service_factory.h"
+#include "chrome/browser/tab_contents/tab_util.h"
+#include "chrome/browser/ui/browser_finder.h"
+#include "chrome/browser/ui/browser_list.h"
+#include "chrome/browser/ui/browser_tabstrip.h"
+#include "chrome/browser/ui/browser_window.h"
+#include "chrome/browser/ui/chrome_pages.h"
+#include "chrome/browser/ui/sync/one_click_signin_sync_observer.h"
+#include "chrome/browser/ui/sync/one_click_signin_sync_starter.h"
+#include "chrome/browser/ui/tab_modal_confirm_dialog.h"
+#include "chrome/browser/ui/tab_modal_confirm_dialog_delegate.h"
+#include "chrome/browser/ui/tabs/tab_strip_model.h"
+#include "chrome/browser/ui/webui/signin/login_ui_service_factory.h"
+#include "chrome/common/chrome_version_info.h"
+#include "chrome/common/net/url_util.h"
+#include "chrome/common/pref_names.h"
+#include "chrome/common/url_constants.h"
+#include "chrome/grit/chromium_strings.h"
+#include "chrome/grit/generated_resources.h"
+#include "components/autofill/core/common/password_form.h"
+#include "components/google/core/browser/google_util.h"
+#include "components/password_manager/core/browser/password_manager.h"
+#include "components/signin/core/browser/signin_client.h"
+#include "components/signin/core/browser/signin_error_controller.h"
+#include "components/signin/core/browser/signin_manager.h"
+#include "components/signin/core/browser/signin_manager_cookie_helper.h"
+#include "components/signin/core/browser/signin_metrics.h"
+#include "components/signin/core/common/profile_management_switches.h"
+#include "components/sync_driver/sync_prefs.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/navigation_entry.h"
+#include "content/public/browser/page_navigator.h"
+#include "content/public/browser/render_frame_host.h"
+#include "content/public/browser/render_process_host.h"
+#include "content/public/browser/web_contents.h"
+#include "content/public/browser/web_contents_delegate.h"
+#include "content/public/common/frame_navigate_params.h"
+#include "google_apis/gaia/gaia_auth_util.h"
+#include "google_apis/gaia/gaia_urls.h"
+#include "grit/components_strings.h"
+#include "ipc/ipc_message_macros.h"
+#include "net/base/url_util.h"
+#include "net/cookies/cookie_monster.h"
+#include "net/url_request/url_request.h"
+#include "ui/base/l10n/l10n_util.h"
+#include "ui/base/page_transition_types.h"
+#include "url/gurl.h"
+
+
+namespace {
+
+// ConfirmEmailDialogDelegate -------------------------------------------------
+
+class ConfirmEmailDialogDelegate : public TabModalConfirmDialogDelegate {
+ public:
+  enum Action {
+    CREATE_NEW_USER,
+    START_SYNC,
+    CLOSE
+  };
+
+  // Callback indicating action performed by the user.
+  typedef base::Callback<void(Action)> Callback;
+
+  // Ask the user for confirmation before starting to sync.
+  static void AskForConfirmation(content::WebContents* contents,
+                                 const std::string& last_email,
+                                 const std::string& email,
+                                 Callback callback);
+
+ private:
+  ConfirmEmailDialogDelegate(content::WebContents* contents,
+                             const std::string& last_email,
+                             const std::string& email,
+                             Callback callback);
+  ~ConfirmEmailDialogDelegate() override;
+
+  // TabModalConfirmDialogDelegate:
+  base::string16 GetTitle() override;
+  base::string16 GetDialogMessage() override;
+  base::string16 GetAcceptButtonTitle() override;
+  base::string16 GetCancelButtonTitle() override;
+  base::string16 GetLinkText() const override;
+  void OnAccepted() override;
+  void OnCanceled() override;
+  void OnClosed() override;
+  void OnLinkClicked(WindowOpenDisposition disposition) override;
+
+  std::string last_email_;
+  std::string email_;
+  Callback callback_;
+
+  // Web contents from which the "Learn more" link should be opened.
+  content::WebContents* web_contents_;
+
+  DISALLOW_COPY_AND_ASSIGN(ConfirmEmailDialogDelegate);
+};
+
+// static
+void ConfirmEmailDialogDelegate::AskForConfirmation(
+    content::WebContents* contents,
+    const std::string& last_email,
+    const std::string& email,
+    Callback callback) {
+  TabModalConfirmDialog::Create(
+      new ConfirmEmailDialogDelegate(contents, last_email, email,
+                                     callback), contents);
+}
+
+ConfirmEmailDialogDelegate::ConfirmEmailDialogDelegate(
+    content::WebContents* contents,
+    const std::string& last_email,
+    const std::string& email,
+    Callback callback)
+  : TabModalConfirmDialogDelegate(contents),
+    last_email_(last_email),
+    email_(email),
+    callback_(callback),
+    web_contents_(contents) {
+}
+
+ConfirmEmailDialogDelegate::~ConfirmEmailDialogDelegate() {
+}
+
+base::string16 ConfirmEmailDialogDelegate::GetTitle() {
+  return l10n_util::GetStringUTF16(
+      IDS_ONE_CLICK_SIGNIN_CONFIRM_EMAIL_DIALOG_TITLE);
+}
+
+base::string16 ConfirmEmailDialogDelegate::GetDialogMessage() {
+  return l10n_util::GetStringFUTF16(
+      IDS_ONE_CLICK_SIGNIN_CONFIRM_EMAIL_DIALOG_MESSAGE,
+      base::UTF8ToUTF16(last_email_), base::UTF8ToUTF16(email_));
+}
+
+base::string16 ConfirmEmailDialogDelegate::GetAcceptButtonTitle() {
+  return l10n_util::GetStringUTF16(
+      IDS_ONE_CLICK_SIGNIN_CONFIRM_EMAIL_DIALOG_OK_BUTTON);
+}
+
+base::string16 ConfirmEmailDialogDelegate::GetCancelButtonTitle() {
+  return l10n_util::GetStringUTF16(
+      IDS_ONE_CLICK_SIGNIN_CONFIRM_EMAIL_DIALOG_CANCEL_BUTTON);
+}
+
+base::string16 ConfirmEmailDialogDelegate::GetLinkText() const {
+  return l10n_util::GetStringUTF16(IDS_LEARN_MORE);
+}
+
+void ConfirmEmailDialogDelegate::OnAccepted() {
+  base::ResetAndReturn(&callback_).Run(CREATE_NEW_USER);
+}
+
+void ConfirmEmailDialogDelegate::OnCanceled() {
+  base::ResetAndReturn(&callback_).Run(START_SYNC);
+}
+
+void ConfirmEmailDialogDelegate::OnClosed() {
+  base::ResetAndReturn(&callback_).Run(CLOSE);
+}
+
+void ConfirmEmailDialogDelegate::OnLinkClicked(
+    WindowOpenDisposition disposition) {
+  content::OpenURLParams params(
+      GURL(chrome::kChromeSyncMergeTroubleshootingURL),
+      content::Referrer(),
+      NEW_POPUP,
+      ui::PAGE_TRANSITION_AUTO_TOPLEVEL,
+      false);
+  // It is guaranteed that |web_contents_| is valid here because when it's
+  // deleted, the dialog is immediately closed and no further action can be
+  // performed.
+  web_contents_->OpenURL(params);
+}
+
+
+// Helpers --------------------------------------------------------------------
+
+// Add a specific email to the list of emails rejected for one-click
+// sign-in, for this profile.
+void AddEmailToOneClickRejectedList(Profile* profile,
+                                    const std::string& email) {
+  ListPrefUpdate updater(profile->GetPrefs(),
+                         prefs::kReverseAutologinRejectedEmailList);
+  updater->AppendIfNotPresent(new base::StringValue(email));
+}
+
+// Start syncing with the given user information.
+void StartSync(const OneClickSigninHelper::StartSyncArgs& args,
+               OneClickSigninSyncStarter::StartSyncMode start_mode) {
+  if (start_mode == OneClickSigninSyncStarter::UNDO_SYNC) {
+    OneClickSigninHelper::LogHistogramValue(signin_metrics::HISTOGRAM_UNDO);
+    return;
+  }
+
+  // The wrapper deletes itself once it's done.
+  OneClickSigninHelper::SyncStarterWrapper* wrapper =
+      new OneClickSigninHelper::SyncStarterWrapper(args, start_mode);
+  wrapper->Start();
+
+  int action = signin_metrics::HISTOGRAM_MAX;
+  switch (args.auto_accept) {
+    case OneClickSigninHelper::AUTO_ACCEPT_EXPLICIT:
+      break;
+    case OneClickSigninHelper::AUTO_ACCEPT_ACCEPTED:
+      action =
+          start_mode == OneClickSigninSyncStarter::SYNC_WITH_DEFAULT_SETTINGS ?
+              signin_metrics::HISTOGRAM_AUTO_WITH_DEFAULTS :
+              signin_metrics::HISTOGRAM_AUTO_WITH_ADVANCED;
+      break;
+    case OneClickSigninHelper::AUTO_ACCEPT_CONFIGURE:
+      DCHECK(start_mode == OneClickSigninSyncStarter::CONFIGURE_SYNC_FIRST);
+      action = signin_metrics::HISTOGRAM_AUTO_WITH_ADVANCED;
+      break;
+    default:
+      NOTREACHED() << "Invalid auto_accept: " << args.auto_accept;
+      break;
+  }
+  if (action != signin_metrics::HISTOGRAM_MAX)
+    OneClickSigninHelper::LogHistogramValue(action);
+}
+
+void StartExplicitSync(const OneClickSigninHelper::StartSyncArgs& args,
+                       content::WebContents* contents,
+                       OneClickSigninSyncStarter::StartSyncMode start_mode,
+                       ConfirmEmailDialogDelegate::Action action) {
+  if (action == ConfirmEmailDialogDelegate::START_SYNC) {
+    StartSync(args, start_mode);
+  } else {
+    // Perform a redirection to the NTP/Apps page to hide the blank page when
+    // the action is CLOSE or CREATE_NEW_USER. The redirection is useful when
+    // the action is CREATE_NEW_USER because the "Create new user" page might
+    // be opened in a different tab that is already showing settings.
+    args.callback.Run(OneClickSigninSyncStarter::SYNC_SETUP_FAILURE);
+    if (action == ConfirmEmailDialogDelegate::CREATE_NEW_USER) {
+      chrome::ShowSettingsSubPage(args.browser,
+                                  std::string(chrome::kCreateProfileSubPage));
+    }
+  }
+}
+
+void ClearPendingEmailOnIOThread(content::ResourceContext* context) {
+  ProfileIOData* io_data = ProfileIOData::FromResourceContext(context);
+  DCHECK(io_data);
+  io_data->set_reverse_autologin_pending_email(std::string());
+}
+
+// Determines the source of the sign in and the continue URL.  It's either one
+// of the known sign-in access points (first run, NTP, Apps page, menu, or
+// settings) or it's an implicit sign in via another Google property.  In the
+// former case, "service" is also checked to make sure its "chromiumsync".
+signin_metrics::Source GetSigninSource(const GURL& url, GURL* continue_url) {
+  DCHECK(url.is_valid());
+  std::string value;
+  net::GetValueForKeyInQuery(url, "service", &value);
+  bool possibly_an_explicit_signin = value == "chromiumsync";
+
+  // Find the final continue URL for this sign in.  In some cases, Gaia can
+  // continue to itself, with the original continue URL buried under a couple
+  // of layers of indirection.  Peel those layers away.  The final destination
+  // can also be "IsGaiaSignonRealm" so stop if we get to the end (but be sure
+  // we always extract at least one "continue" value).
+  GURL local_continue_url = signin::GetNextPageURLForPromoURL(url);
+  while (gaia::IsGaiaSignonRealm(local_continue_url.GetOrigin())) {
+    GURL next_continue_url =
+        signin::GetNextPageURLForPromoURL(local_continue_url);
+    if (!next_continue_url.is_valid())
+      break;
+    local_continue_url = next_continue_url;
+  }
+
+  if (continue_url && local_continue_url.is_valid()) {
+    DCHECK(!continue_url->is_valid() || *continue_url == local_continue_url);
+    *continue_url = local_continue_url;
+  }
+
+  return possibly_an_explicit_signin ?
+      signin::GetSourceForPromoURL(local_continue_url) :
+      signin_metrics::SOURCE_UNKNOWN;
+}
+
+// Returns true if |url| is a valid URL that can occur during the sign in
+// process.  Valid URLs are of the form:
+//
+//    https://accounts.google.{TLD}/...
+//    https://accounts.youtube.com/...
+//    https://accounts.blogger.com/...
+//
+// All special headers used by one click sign in occur on
+// https://accounts.google.com URLs.  However, the sign in process may redirect
+// to intermediate Gaia URLs that do not end with .com.  For example, an account
+// that uses SMS 2-factor outside the US may redirect to country specific URLs.
+//
+// The sign in process may also redirect to youtube and blogger account URLs
+// so that Gaia acts as a single signon service.
+bool IsValidGaiaSigninRedirectOrResponseURL(const GURL& url) {
+  std::string hostname = url.host();
+  if (google_util::IsGoogleHostname(hostname, google_util::ALLOW_SUBDOMAIN)) {
+    // Also using IsGaiaSignonRealm() to handle overriding with command line.
+    return gaia::IsGaiaSignonRealm(url.GetOrigin()) ||
+        StartsWithASCII(hostname, "accounts.", false);
+  }
+
+  GURL origin = url.GetOrigin();
+  if (origin == GURL("https://accounts.youtube.com") ||
+      origin == GURL("https://accounts.blogger.com"))
+    return true;
+
+  return false;
+}
+
+// Tells when we are in the process of showing either the signin to chrome page
+// or the one click sign in to chrome page.
+// NOTE: This should only be used for logging purposes since it relies on hard
+// coded URLs that could change.
+bool AreWeShowingSignin(GURL url,
+                        signin_metrics::Source source,
+                        std::string email) {
+  GURL::Replacements replacements;
+  replacements.ClearQuery();
+  GURL clean_login_url =
+      GaiaUrls::GetInstance()->service_login_url().ReplaceComponents(
+          replacements);
+
+  return (url.ReplaceComponents(replacements) == clean_login_url &&
+          source != signin_metrics::SOURCE_UNKNOWN) ||
+      (IsValidGaiaSigninRedirectOrResponseURL(url) &&
+       url.spec().find("ChromeLoginPrompt") != std::string::npos &&
+       !email.empty());
+}
+
+// If profile is valid then get signin scoped device id from signin client.
+// Otherwise returns empty string.
+std::string GetSigninScopedDeviceId(Profile* profile) {
+  std::string signin_scoped_device_id;
+  SigninClient* signin_client =
+      profile ? ChromeSigninClientFactory::GetForProfile(profile) : NULL;
+  if (signin_client) {
+    signin_scoped_device_id = signin_client->GetSigninScopedDeviceId();
+  }
+  return signin_scoped_device_id;
+}
+
+// CurrentHistoryCleaner ------------------------------------------------------
+
+// Watch a webcontents and remove URL from the history once loading is complete.
+// We have to delay the cleaning until the new URL has finished loading because
+// we're not allowed to remove the last-loaded URL from the history.  Objects
+// of this type automatically self-destruct once they're finished their work.
+class CurrentHistoryCleaner : public content::WebContentsObserver {
+ public:
+  explicit CurrentHistoryCleaner(content::WebContents* contents);
+  ~CurrentHistoryCleaner() override;
+
+  // content::WebContentsObserver:
+  void WebContentsDestroyed() override;
+  void DidCommitProvisionalLoadForFrame(
+      content::RenderFrameHost* render_frame_host,
+      const GURL& url,
+      ui::PageTransition transition_type) override;
+
+ private:
+  scoped_ptr<content::WebContents> contents_;
+  int history_index_to_remove_;
+
+  DISALLOW_COPY_AND_ASSIGN(CurrentHistoryCleaner);
+};
+
+CurrentHistoryCleaner::CurrentHistoryCleaner(content::WebContents* contents)
+    : WebContentsObserver(contents) {
+  history_index_to_remove_ =
+      web_contents()->GetController().GetLastCommittedEntryIndex();
+}
+
+CurrentHistoryCleaner::~CurrentHistoryCleaner() {
+}
+
+void CurrentHistoryCleaner::DidCommitProvisionalLoadForFrame(
+    content::RenderFrameHost* render_frame_host,
+    const GURL& url,
+    ui::PageTransition transition_type) {
+  // Return early if this is not top-level navigation.
+  if (render_frame_host->GetParent())
+    return;
+}
+
+void CurrentHistoryCleaner::WebContentsDestroyed() {
+  delete this;  // Failure.
+}
+
+}  // namespace
+
+
+// StartSyncArgs --------------------------------------------------------------
+
+OneClickSigninHelper::StartSyncArgs::StartSyncArgs()
+    : profile(NULL),
+      browser(NULL),
+      auto_accept(AUTO_ACCEPT_NONE),
+      web_contents(NULL),
+      confirmation_required(OneClickSigninSyncStarter::NO_CONFIRMATION),
+      source(signin_metrics::SOURCE_UNKNOWN) {}
+
+OneClickSigninHelper::StartSyncArgs::StartSyncArgs(
+    Profile* profile,
+    Browser* browser,
+    OneClickSigninHelper::AutoAccept auto_accept,
+    const std::string& session_index,
+    const std::string& email,
+    const std::string& password,
+    const std::string& refresh_token,
+    content::WebContents* web_contents,
+    bool untrusted_confirmation_required,
+    signin_metrics::Source source,
+    OneClickSigninSyncStarter::Callback callback)
+    : profile(profile),
+      browser(browser),
+      auto_accept(auto_accept),
+      session_index(session_index),
+      email(email),
+      password(password),
+      refresh_token(refresh_token),
+      web_contents(web_contents),
+      source(source),
+      callback(callback) {
+  DCHECK(session_index.empty() != refresh_token.empty());
+  if (untrusted_confirmation_required) {
+    confirmation_required = OneClickSigninSyncStarter::CONFIRM_UNTRUSTED_SIGNIN;
+  } else if (source == signin_metrics::SOURCE_SETTINGS) {
+    // Do not display a status confirmation for re-auth.
+    confirmation_required = OneClickSigninSyncStarter::NO_CONFIRMATION;
+  } else {
+    confirmation_required = OneClickSigninSyncStarter::CONFIRM_AFTER_SIGNIN;
+  }
+}
+
+OneClickSigninHelper::StartSyncArgs::~StartSyncArgs() {}
+
+// SyncStarterWrapper ---------------------------------------------------------
+
+OneClickSigninHelper::SyncStarterWrapper::SyncStarterWrapper(
+      const OneClickSigninHelper::StartSyncArgs& args,
+      OneClickSigninSyncStarter::StartSyncMode start_mode)
+    : args_(args), start_mode_(start_mode), weak_pointer_factory_(this) {
+  BrowserList::AddObserver(this);
+
+  // Cache the parent desktop for the browser, so we can reuse that same
+  // desktop for any UI we want to display.
+  desktop_type_ = args_.browser ? args_.browser->host_desktop_type()
+                                : chrome::GetActiveDesktop();
+}
+
+OneClickSigninHelper::SyncStarterWrapper::~SyncStarterWrapper() {
+  BrowserList::RemoveObserver(this);
+}
+
+void OneClickSigninHelper::SyncStarterWrapper::Start() {
+  if (args_.refresh_token.empty()) {
+    if (args_.password.empty()) {
+      VerifyGaiaCookiesBeforeSignIn();
+    } else {
+      StartSigninOAuthHelper();
+    }
+  } else {
+    OnSigninOAuthInformationAvailable(args_.email, args_.email,
+                                      args_.refresh_token);
+  }
+}
+
+void
+OneClickSigninHelper::SyncStarterWrapper::OnSigninOAuthInformationAvailable(
+    const std::string& email,
+    const std::string& display_email,
+    const std::string& refresh_token) {
+  if (!gaia::AreEmailsSame(display_email, args_.email)) {
+    DisplayErrorBubble(
+        GoogleServiceAuthError(
+            GoogleServiceAuthError::INVALID_GAIA_CREDENTIALS).ToString());
+  } else {
+    StartOneClickSigninSyncStarter(email, refresh_token);
+  }
+
+  base::MessageLoop::current()->DeleteSoon(FROM_HERE, this);
+}
+
+void OneClickSigninHelper::SyncStarterWrapper::OnSigninOAuthInformationFailure(
+  const GoogleServiceAuthError& error) {
+  DisplayErrorBubble(error.ToString());
+  base::MessageLoop::current()->DeleteSoon(FROM_HERE, this);
+}
+
+void OneClickSigninHelper::SyncStarterWrapper::OnBrowserRemoved(
+    Browser* browser) {
+  if (args_.browser == browser)
+    args_.browser = NULL;
+}
+
+void OneClickSigninHelper::SyncStarterWrapper::VerifyGaiaCookiesBeforeSignIn() {
+  scoped_refptr<SigninManagerCookieHelper> cookie_helper(
+      new SigninManagerCookieHelper(
+          args_.profile->GetRequestContext(),
+          content::BrowserThread::GetMessageLoopProxyForThread(
+              content::BrowserThread::UI),
+          content::BrowserThread::GetMessageLoopProxyForThread(
+              content::BrowserThread::IO)));
+  cookie_helper->StartFetchingGaiaCookiesOnUIThread(
+      base::Bind(&SyncStarterWrapper::OnGaiaCookiesFetched,
+                 weak_pointer_factory_.GetWeakPtr(),
+                 args_.session_index));
+}
+
+void OneClickSigninHelper::SyncStarterWrapper::OnGaiaCookiesFetched(
+    const std::string session_index, const net::CookieList& cookie_list) {
+  net::CookieList::const_iterator it;
+  bool success = false;
+  for (it = cookie_list.begin(); it != cookie_list.end(); ++it) {
+    // Make sure the LSID cookie is set on the GAIA host, instead of a super-
+    // domain.
+    if (it->Name() == "LSID") {
+      if (it->IsHostCookie() && it->IsHttpOnly() && it->IsSecure()) {
+        // Found a valid LSID cookie. Continue loop to make sure we don't have
+        // invalid LSID cookies on any super-domain.
+        success = true;
+      } else {
+        success = false;
+        break;
+      }
+    }
+  }
+
+  if (success) {
+    StartSigninOAuthHelper();
+  } else {
+    DisplayErrorBubble(
+        GoogleServiceAuthError(
+            GoogleServiceAuthError::INVALID_GAIA_CREDENTIALS).ToString());
+    base::MessageLoop::current()->DeleteSoon(FROM_HERE, this);
+  }
+}
+
+void OneClickSigninHelper::SyncStarterWrapper::DisplayErrorBubble(
+    const std::string& error_message) {
+  args_.browser = OneClickSigninSyncStarter::EnsureBrowser(
+      args_.browser, args_.profile, desktop_type_);
+  LoginUIServiceFactory::GetForProfile(args_.profile)->DisplayLoginResult(
+      args_.browser, base::UTF8ToUTF16(error_message));
+}
+
+void OneClickSigninHelper::SyncStarterWrapper::StartSigninOAuthHelper() {
+  std::string signin_scoped_device_id = GetSigninScopedDeviceId(args_.profile);
+  signin_oauth_helper_.reset(
+      new SigninOAuthHelper(args_.profile->GetRequestContext(),
+                            args_.session_index,
+                            signin_scoped_device_id,
+                            this));
+}
+
+void
+OneClickSigninHelper::SyncStarterWrapper::StartOneClickSigninSyncStarter(
+    const std::string& email,
+    const std::string& refresh_token) {
+  // The starter deletes itself once it's done.
+  new OneClickSigninSyncStarter(args_.profile, args_.browser,
+                                email, args_.password,
+                                refresh_token, start_mode_,
+                                args_.web_contents,
+                                args_.confirmation_required,
+                                GURL(),
+                                args_.callback);
+}
+
+
+// OneClickSigninHelper -------------------------------------------------------
+
+DEFINE_WEB_CONTENTS_USER_DATA_KEY(OneClickSigninHelper);
+
+// static
+const int OneClickSigninHelper::kMaxNavigationsSince = 10;
+
+OneClickSigninHelper::OneClickSigninHelper(content::WebContents* web_contents)
+    : content::WebContentsObserver(web_contents),
+      showing_signin_(false),
+      auto_accept_(AUTO_ACCEPT_NONE),
+      source_(signin_metrics::SOURCE_UNKNOWN),
+      switched_to_advanced_(false),
+      untrusted_navigations_since_signin_visit_(0),
+      untrusted_confirmation_required_(false),
+      do_not_clear_pending_email_(false),
+      do_not_start_sync_for_testing_(false),
+      weak_pointer_factory_(this) {
+  ChromePasswordManagerClient* client =
+      ChromePasswordManagerClient::FromWebContents(web_contents);
+  // May be NULL during testing.
+  if (client) {
+    client->GetPasswordManager()->AddSubmissionCallback(
+        base::Bind(&OneClickSigninHelper::PasswordSubmitted,
+                   weak_pointer_factory_.GetWeakPtr()));
+  }
+}
+
+OneClickSigninHelper::~OneClickSigninHelper() {}
+
+// static
+void OneClickSigninHelper::LogHistogramValue(int action) {
+  UMA_HISTOGRAM_ENUMERATION("Signin.AllAccessPointActions", action,
+                            signin_metrics::HISTOGRAM_MAX);
+}
+
+// static
+bool OneClickSigninHelper::CanOffer(content::WebContents* web_contents,
+                                    CanOfferFor can_offer_for,
+                                    const std::string& email,
+                                    std::string* error_message) {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+    VLOG(1) << "OneClickSigninHelper::CanOffer";
+
+  if (error_message)
+    error_message->clear();
+
+  if (!web_contents)
+    return false;
+
+  if (web_contents->GetBrowserContext()->IsOffTheRecord())
+    return false;
+
+  Profile* profile =
+      Profile::FromBrowserContext(web_contents->GetBrowserContext());
+  if (!profile)
+    return false;
+
+  SigninManager* manager =
+      SigninManagerFactory::GetForProfile(profile);
+  if (manager && !manager->IsSigninAllowed())
+    return false;
+
+  if (can_offer_for == CAN_OFFER_FOR_INTERSTITAL_ONLY &&
+      !profile->GetPrefs()->GetBoolean(prefs::kReverseAutologinEnabled))
+    return false;
+
+  if (!ChromeSigninClient::ProfileAllowsSigninCookies(profile))
+    return false;
+
+  if (!email.empty()) {
+    if (!manager)
+      return false;
+
+    // Make sure this username is not prohibited by policy.
+    if (!manager->IsAllowedUsername(email)) {
+      if (error_message) {
+        error_message->assign(
+            l10n_util::GetStringUTF8(IDS_SYNC_LOGIN_NAME_PROHIBITED));
+      }
+      return false;
+    }
+
+    if (can_offer_for != CAN_OFFER_FOR_SECONDARY_ACCOUNT) {
+      // If the signin manager already has an authenticated name, then this is a
+      // re-auth scenario.  Make sure the email just signed in corresponds to
+      // the one sign in manager expects.
+      std::string current_email = manager->GetAuthenticatedUsername();
+      const bool same_email = gaia::AreEmailsSame(current_email, email);
+      if (!current_email.empty() && !same_email) {
+        UMA_HISTOGRAM_ENUMERATION("Signin.Reauth",
+                                  signin_metrics::HISTOGRAM_ACCOUNT_MISSMATCH,
+                                  signin_metrics::HISTOGRAM_MAX);
+        if (error_message) {
+          error_message->assign(
+              l10n_util::GetStringFUTF8(IDS_SYNC_WRONG_EMAIL,
+                                        base::UTF8ToUTF16(current_email)));
+        }
+        return false;
+      }
+
+      // If some profile, not just the current one, is already connected to this
+      // account, don't show the infobar.
+      if (g_browser_process && !same_email) {
+        ProfileManager* manager = g_browser_process->profile_manager();
+        if (manager) {
+          ProfileInfoCache& cache = manager->GetProfileInfoCache();
+          for (size_t i = 0; i < cache.GetNumberOfProfiles(); ++i) {
+            std::string current_email =
+                base::UTF16ToUTF8(cache.GetUserNameOfProfileAtIndex(i));
+            if (gaia::AreEmailsSame(email, current_email)) {
+              if (error_message) {
+                error_message->assign(
+                    l10n_util::GetStringUTF8(IDS_SYNC_USER_NAME_IN_USE_ERROR));
+              }
+              return false;
+            }
+          }
+        }
+      }
+    }
+
+    // If email was already rejected by this profile for one-click sign-in.
+    if (can_offer_for == CAN_OFFER_FOR_INTERSTITAL_ONLY) {
+      const base::ListValue* rejected_emails = profile->GetPrefs()->GetList(
+          prefs::kReverseAutologinRejectedEmailList);
+      if (!rejected_emails->empty()) {
+        base::ListValue::const_iterator iter = rejected_emails->Find(
+            base::StringValue(email));
+        if (iter != rejected_emails->end())
+          return false;
+      }
+    }
+  }
+
+  VLOG(1) << "OneClickSigninHelper::CanOffer: yes we can";
+  return true;
+}
+
+// static
+OneClickSigninHelper::Offer OneClickSigninHelper::CanOfferOnIOThread(
+    net::URLRequest* request,
+    ProfileIOData* io_data) {
+  return CanOfferOnIOThreadImpl(request->url(), request, io_data);
+}
+
+// static
+OneClickSigninHelper::Offer OneClickSigninHelper::CanOfferOnIOThreadImpl(
+    const GURL& url,
+    base::SupportsUserData* request,
+    ProfileIOData* io_data) {
+  if (!gaia::IsGaiaSignonRealm(url.GetOrigin()))
+    return IGNORE_REQUEST;
+
+  if (!io_data)
+    return DONT_OFFER;
+
+  // Check for incognito before other parts of the io_data, since those
+  // members may not be initalized.
+  if (io_data->IsOffTheRecord())
+    return DONT_OFFER;
+
+  if (!io_data->signin_allowed()->GetValue())
+    return DONT_OFFER;
+
+  if (!io_data->reverse_autologin_enabled()->GetValue())
+    return DONT_OFFER;
+
+  if (!io_data->google_services_username()->GetValue().empty())
+    return DONT_OFFER;
+
+  if (!ChromeSigninClient::SettingsAllowSigninCookies(
+          io_data->GetCookieSettings()))
+    return DONT_OFFER;
+
+  // The checks below depend on chrome already knowing what account the user
+  // signed in with.  This happens only after receiving the response containing
+  // the Google-Accounts-SignIn header.  Until then, if there is even a chance
+  // that we want to connect the profile, chrome needs to tell Gaia that
+  // it should offer the interstitial.  Therefore missing one click data on
+  // the request means can offer is true.
+  const std::string& pending_email = io_data->reverse_autologin_pending_email();
+  if (!pending_email.empty()) {
+    if (!SigninManager::IsUsernameAllowedByPolicy(pending_email,
+            io_data->google_services_username_pattern()->GetValue())) {
+      return DONT_OFFER;
+    }
+
+    std::vector<std::string> rejected_emails =
+        io_data->one_click_signin_rejected_email_list()->GetValue();
+    if (std::count_if(rejected_emails.begin(), rejected_emails.end(),
+                      std::bind2nd(std::equal_to<std::string>(),
+                                   pending_email)) > 0) {
+      return DONT_OFFER;
+    }
+
+    if (io_data->signin_names()->GetEmails().count(
+            base::UTF8ToUTF16(pending_email)) > 0) {
+      return DONT_OFFER;
+    }
+  }
+
+  return CAN_OFFER;
+}
+
+// static
+void OneClickSigninHelper::ShowInfoBarIfPossible(net::URLRequest* request,
+                                                 ProfileIOData* io_data,
+                                                 int child_id,
+                                                 int route_id) {
+  std::string google_chrome_signin_value;
+  std::string google_accounts_signin_value;
+  request->GetResponseHeaderByName("Google-Chrome-SignIn",
+                                   &google_chrome_signin_value);
+  request->GetResponseHeaderByName("Google-Accounts-SignIn",
+                                   &google_accounts_signin_value);
+
+  if (!google_accounts_signin_value.empty() ||
+      !google_chrome_signin_value.empty()) {
+    VLOG(1) << "OneClickSigninHelper::ShowInfoBarIfPossible:"
+            << " g-a-s='" << google_accounts_signin_value << "'"
+            << " g-c-s='" << google_chrome_signin_value << "'";
+  }
+
+  if (!gaia::IsGaiaSignonRealm(request->url().GetOrigin()))
+    return;
+
+  // Parse Google-Accounts-SignIn.
+  base::StringPairs pairs;
+  base::SplitStringIntoKeyValuePairs(google_accounts_signin_value, '=', ',',
+                                     &pairs);
+  std::string session_index;
+  std::string email;
+  for (size_t i = 0; i < pairs.size(); ++i) {
+    const std::pair<std::string, std::string>& pair = pairs[i];
+    const std::string& key = pair.first;
+    const std::string& value = pair.second;
+    if (key == "email") {
+      base::TrimString(value, "\"", &email);
+    } else if (key == "sessionindex") {
+      session_index = value;
+    }
+  }
+
+  // Later in the chain of this request, we'll need to check the email address
+  // in the IO thread (see CanOfferOnIOThread).  So save the email address as
+  // user data on the request (only for web-based flow).
+  if (!email.empty())
+    io_data->set_reverse_autologin_pending_email(email);
+
+  if (!email.empty() || !session_index.empty()) {
+    VLOG(1) << "OneClickSigninHelper::ShowInfoBarIfPossible:"
+            << " email=" << email
+            << " sessionindex=" << session_index;
+  }
+
+  // Parse Google-Chrome-SignIn.
+  AutoAccept auto_accept = AUTO_ACCEPT_NONE;
+  signin_metrics::Source source = signin_metrics::SOURCE_UNKNOWN;
+  GURL continue_url;
+  std::vector<std::string> tokens;
+  base::SplitString(google_chrome_signin_value, ',', &tokens);
+  for (size_t i = 0; i < tokens.size(); ++i) {
+    const std::string& token = tokens[i];
+    if (token == "accepted") {
+      auto_accept = AUTO_ACCEPT_ACCEPTED;
+    } else if (token == "configure") {
+      auto_accept = AUTO_ACCEPT_CONFIGURE;
+    } else if (token == "rejected-for-profile") {
+      auto_accept = AUTO_ACCEPT_REJECTED_FOR_PROFILE;
+    }
+  }
+
+  // If this is an explicit sign in (i.e., first run, NTP, Apps page, menu,
+  // settings) then force the auto accept type to explicit.
+  source = GetSigninSource(request->url(), &continue_url);
+  if (source != signin_metrics::SOURCE_UNKNOWN)
+    auto_accept = AUTO_ACCEPT_EXPLICIT;
+
+  if (auto_accept != AUTO_ACCEPT_NONE) {
+    VLOG(1) << "OneClickSigninHelper::ShowInfoBarIfPossible:"
+            << " auto_accept=" << auto_accept;
+  }
+
+  // If |session_index|, |email|, |auto_accept|, and |continue_url| all have
+  // their default value, don't bother posting a task to the UI thread.
+  // It will be a noop anyway.
+  //
+  // The two headers above may (but not always) come in different http requests
+  // so a post to the UI thread is still needed if |auto_accept| is not its
+  // default value, but |email| and |session_index| are.
+  if (session_index.empty() && email.empty() &&
+      auto_accept == AUTO_ACCEPT_NONE && !continue_url.is_valid()) {
+    return;
+  }
+
+  content::BrowserThread::PostTask(
+      content::BrowserThread::UI, FROM_HERE,
+      base::Bind(&OneClickSigninHelper::ShowInfoBarUIThread, session_index,
+                 email, auto_accept, source, continue_url, child_id, route_id));
+}
+
+// static
+void OneClickSigninHelper::LogConfirmHistogramValue(int action) {
+  UMA_HISTOGRAM_ENUMERATION("Signin.OneClickConfirmation", action,
+                            signin_metrics::HISTOGRAM_CONFIRM_MAX);
+}
+// static
+void OneClickSigninHelper::ShowInfoBarUIThread(
+    const std::string& session_index,
+    const std::string& email,
+    AutoAccept auto_accept,
+    signin_metrics::Source source,
+    const GURL& continue_url,
+    int child_id,
+    int route_id) {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+
+  content::WebContents* web_contents = tab_util::GetWebContentsByID(child_id,
+                                                                    route_id);
+  if (!web_contents)
+    return;
+
+  // TODO(mathp): The appearance of this infobar should be tested using a
+  // browser_test.
+  OneClickSigninHelper* helper =
+      OneClickSigninHelper::FromWebContents(web_contents);
+  if (!helper)
+    return;
+
+  if (auto_accept != AUTO_ACCEPT_NONE)
+    helper->auto_accept_ = auto_accept;
+
+  if (source != signin_metrics::SOURCE_UNKNOWN &&
+      helper->source_ == signin_metrics::SOURCE_UNKNOWN) {
+    helper->source_ = source;
+  }
+
+  // Save the email in the one-click signin manager.  The manager may
+  // not exist if the contents is incognito or if the profile is already
+  // connected to a Google account.
+  if (!session_index.empty())
+    helper->session_index_ = session_index;
+
+  if (!email.empty())
+    helper->email_ = email;
+
+  CanOfferFor can_offer_for =
+      (auto_accept != AUTO_ACCEPT_EXPLICIT &&
+          helper->auto_accept_ != AUTO_ACCEPT_EXPLICIT) ?
+          CAN_OFFER_FOR_INTERSTITAL_ONLY : CAN_OFFER_FOR_ALL;
+
+  std::string error_message;
+
+  if (!web_contents || !CanOffer(web_contents, can_offer_for, email,
+                                 &error_message)) {
+    VLOG(1) << "OneClickSigninHelper::ShowInfoBarUIThread: not offering";
+    // TODO(rogerta): Can we just display our error now instead of keeping it
+    // around and doing it later?
+    if (helper && helper->error_message_.empty() && !error_message.empty())
+      helper->error_message_ = error_message;
+
+    return;
+  }
+
+  // Only allow the dedicated signin process to sign the user into
+  // Chrome without intervention, because it doesn't load any untrusted
+  // pages.  If at any point an untrusted page is detected, chrome will
+  // show a modal dialog asking the user to confirm.
+  Profile* profile =
+      Profile::FromBrowserContext(web_contents->GetBrowserContext());
+  SigninClient* signin_client =
+      profile ? ChromeSigninClientFactory::GetForProfile(profile) : NULL;
+  helper->untrusted_confirmation_required_ |=
+      (signin_client && !signin_client->IsSigninProcess(child_id));
+
+  if (continue_url.is_valid()) {
+    // Set |original_continue_url_| if it is currently empty. |continue_url|
+    // could be modified by gaia pages, thus we need to record the original
+    // continue url to navigate back to the right page when sync setup is
+    // complete.
+    if (helper->original_continue_url_.is_empty())
+      helper->original_continue_url_ = continue_url;
+    helper->continue_url_ = continue_url;
+  }
+}
+
+// static
+void OneClickSigninHelper::RemoveSigninRedirectURLHistoryItem(
+    content::WebContents* web_contents) {
+}
+
+// static
+bool OneClickSigninHelper::HandleCrossAccountError(
+    Profile* profile,
+    const std::string& session_index,
+    const std::string& email,
+    const std::string& password,
+    const std::string& refresh_token,
+    OneClickSigninHelper::AutoAccept auto_accept,
+    signin_metrics::Source source,
+    OneClickSigninSyncStarter::StartSyncMode start_mode,
+    OneClickSigninSyncStarter::Callback sync_callback) {
+  std::string last_email =
+      profile->GetPrefs()->GetString(prefs::kGoogleServicesLastUsername);
+
+  if (!last_email.empty() && !gaia::AreEmailsSame(last_email, email)) {
+    // If the new email address is different from the email address that
+    // just signed in, show a confirmation dialog on top of the current active
+    // tab.
+
+    // No need to display a second confirmation so pass false below.
+    // TODO(atwilson): Move this into OneClickSigninSyncStarter.
+    // The tab modal dialog always executes its callback before |contents|
+    // is deleted.
+    Browser* browser = chrome::FindLastActiveWithProfile(
+        profile, chrome::GetActiveDesktop());
+    content::WebContents* contents =
+        browser->tab_strip_model()->GetActiveWebContents();
+
+    ConfirmEmailDialogDelegate::AskForConfirmation(
+        contents,
+        last_email,
+        email,
+        base::Bind(
+            &StartExplicitSync,
+            StartSyncArgs(profile, browser, auto_accept,
+                          session_index, email, password,
+                          refresh_token,
+                          contents, false /* confirmation_required */, source,
+                          sync_callback),
+            contents,
+            start_mode));
+    return true;
+  }
+
+  return false;
+}
+
+// static
+void OneClickSigninHelper::RedirectToNtpOrAppsPage(
+    content::WebContents* contents, signin_metrics::Source source) {
+  // Do nothing if a navigation is pending, since this call can be triggered
+  // from DidStartLoading. This avoids deleting the pending entry while we are
+  // still navigating to it. See crbug/346632.
+  if (contents->GetController().GetPendingEntry())
+    return;
+
+  VLOG(1) << "RedirectToNtpOrAppsPage";
+  // Redirect to NTP/Apps page and display a confirmation bubble
+  GURL url(source == signin_metrics::SOURCE_APPS_PAGE_LINK ?
+           chrome::kChromeUIAppsURL : chrome::kChromeUINewTabURL);
+  content::OpenURLParams params(url,
+                                content::Referrer(),
+                                CURRENT_TAB,
+                                ui::PAGE_TRANSITION_AUTO_TOPLEVEL,
+                                false);
+  contents->OpenURL(params);
+}
+
+// static
+void OneClickSigninHelper::RedirectToNtpOrAppsPageIfNecessary(
+    content::WebContents* contents, signin_metrics::Source source) {
+  if (source != signin_metrics::SOURCE_SETTINGS) {
+    RedirectToNtpOrAppsPage(contents, source);
+  }
+}
+
+void OneClickSigninHelper::RedirectToSignin() {
+  VLOG(1) << "OneClickSigninHelper::RedirectToSignin";
+
+  // Extract the existing sounce=X value.  Default to "2" if missing.
+  signin_metrics::Source source = signin::GetSourceForPromoURL(continue_url_);
+  if (source == signin_metrics::SOURCE_UNKNOWN)
+    source = signin_metrics::SOURCE_MENU;
+  GURL page = signin::GetPromoURL(source, false);
+
+  content::WebContents* contents = web_contents();
+  contents->GetController().LoadURL(page,
+                                    content::Referrer(),
+                                    ui::PAGE_TRANSITION_AUTO_TOPLEVEL,
+                                    std::string());
+}
+
+void OneClickSigninHelper::CleanTransientState() {
+  VLOG(1) << "OneClickSigninHelper::CleanTransientState";
+  showing_signin_ = false;
+  email_.clear();
+  password_.clear();
+  auto_accept_ = AUTO_ACCEPT_NONE;
+  source_ = signin_metrics::SOURCE_UNKNOWN;
+  switched_to_advanced_ = false;
+  continue_url_ = GURL();
+  untrusted_navigations_since_signin_visit_ = 0;
+  untrusted_confirmation_required_ = false;
+  error_message_.clear();
+
+  // Post to IO thread to clear pending email.
+  if (!do_not_clear_pending_email_) {
+    Profile* profile =
+        Profile::FromBrowserContext(web_contents()->GetBrowserContext());
+    content::BrowserThread::PostTask(
+        content::BrowserThread::IO, FROM_HERE,
+        base::Bind(&ClearPendingEmailOnIOThread,
+                   base::Unretained(profile->GetResourceContext())));
+  }
+}
+
+void OneClickSigninHelper::PasswordSubmitted(
+    const autofill::PasswordForm& form) {
+  // We only need to scrape the password for Gaia logins.
+  if (gaia::IsGaiaSignonRealm(GURL(form.signon_realm))) {
+    VLOG(1) << "OneClickSigninHelper::DidNavigateAnyFrame: got password";
+    password_ = base::UTF16ToUTF8(form.password_value);
+  }
+}
+
+void OneClickSigninHelper::SetDoNotClearPendingEmailForTesting() {
+  do_not_clear_pending_email_ = true;
+}
+
+void OneClickSigninHelper::set_do_not_start_sync_for_testing() {
+  do_not_start_sync_for_testing_ = true;
+}
+
+void OneClickSigninHelper::DidStartNavigationToPendingEntry(
+    const GURL& url,
+    content::NavigationController::ReloadType reload_type) {
+  VLOG(1) << "OneClickSigninHelper::DidStartNavigationToPendingEntry: url=" <<
+      url.spec();
+  // If the tab navigates to a new page, and this page is not a valid Gaia
+  // sign in redirect or reponse, or the expected continue URL, make sure to
+  // clear the internal state.  This is needed to detect navigations in the
+  // middle of the sign in process that may redirect back to the sign in
+  // process (see crbug.com/181163 for details).
+  GURL::Replacements replacements;
+  replacements.ClearQuery();
+
+  if (!IsValidGaiaSigninRedirectOrResponseURL(url) &&
+      continue_url_.is_valid() &&
+      url.ReplaceComponents(replacements) !=
+          continue_url_.ReplaceComponents(replacements)) {
+    if (++untrusted_navigations_since_signin_visit_ > kMaxNavigationsSince)
+      CleanTransientState();
+  }
+}
+
+void OneClickSigninHelper::DidNavigateMainFrame(
+    const content::LoadCommittedDetails& details,
+    const content::FrameNavigateParams& params) {
+  if (!SigninManager::IsWebBasedSigninFlowURL(params.url)) {
+    // Make sure the renderer process is no longer considered the trusted
+    // sign-in process when a navigation to a non-sign-in URL occurs.
+    Profile* profile =
+        Profile::FromBrowserContext(web_contents()->GetBrowserContext());
+    SigninClient* signin_client =
+        profile ? ChromeSigninClientFactory::GetForProfile(profile) : NULL;
+    int process_id = web_contents()->GetRenderProcessHost()->GetID();
+    if (signin_client && signin_client->IsSigninProcess(process_id))
+      signin_client->ClearSigninProcess();
+
+    // If the navigation to a non-sign-in URL hasn't been triggered by the web
+    // contents, the sign in flow has been aborted and the state must be
+    // cleaned (crbug.com/269421).
+    if (!ui::PageTransitionIsWebTriggerable(params.transition) &&
+        auto_accept_ != AUTO_ACCEPT_NONE) {
+      CleanTransientState();
+    }
+  }
+}
+
+void OneClickSigninHelper::DidStopLoading(
+    content::RenderViewHost* render_view_host) {
+  // If the user left the sign in process, clear all members.
+  // TODO(rogerta): might need to allow some youtube URLs.
+  content::WebContents* contents = web_contents();
+  const GURL url = contents->GetLastCommittedURL();
+  Profile* profile =
+      Profile::FromBrowserContext(contents->GetBrowserContext());
+  VLOG(1) << "OneClickSigninHelper::DidStopLoading: url=" << url.spec();
+
+  if (url.scheme() == content::kChromeUIScheme) {
+    // Suppresses OneClickSigninHelper on webUI pages to avoid inteference with
+    // inline signin flows.
+    VLOG(1) << "OneClickSigninHelper::DidStopLoading: suppressed for url="
+            << url.spec();
+    CleanTransientState();
+    return;
+  }
+
+  // If an error has already occured during the sign in flow, make sure to
+  // display it to the user and abort the process.  Do this only for
+  // explicit sign ins.
+  // TODO(rogerta): Could we move this code back up to ShowInfoBarUIThread()?
+  if (!error_message_.empty() && auto_accept_ == AUTO_ACCEPT_EXPLICIT) {
+    VLOG(1) << "OneClickSigninHelper::DidStopLoading: error=" << error_message_;
+    RemoveSigninRedirectURLHistoryItem(contents);
+    // After we redirect to NTP, our browser pointer gets corrupted because the
+    // WebContents have changed, so grab the browser pointer
+    // before the navigation.
+    Browser* browser = chrome::FindBrowserWithWebContents(contents);
+
+    // Redirect to the landing page and display an error popup.
+    RedirectToNtpOrAppsPage(web_contents(), source_);
+    LoginUIServiceFactory::GetForProfile(profile)->
+        DisplayLoginResult(browser, base::UTF8ToUTF16(error_message_));
+    CleanTransientState();
+    return;
+  }
+
+  if (AreWeShowingSignin(url, source_, email_)) {
+    if (!showing_signin_)
+      LogHistogramValue(signin_metrics::HISTOGRAM_SHOWN);
+    showing_signin_ = true;
+  }
+
+  // When Gaia finally redirects to the continue URL, Gaia will add some
+  // extra query parameters.  So ignore the parameters when checking to see
+  // if the user has continued.  Sometimes locales will redirect to a country-
+  // specific TLD so just make sure it's a valid domain instead of comparing
+  // for an exact match.
+  GURL::Replacements replacements;
+  replacements.ClearQuery();
+  bool google_domain_url = google_util::IsGoogleDomainUrl(
+      url,
+      google_util::ALLOW_SUBDOMAIN,
+      google_util::DISALLOW_NON_STANDARD_PORTS);
+  const bool continue_url_match =
+      google_domain_url &&
+      url.ReplaceComponents(replacements).path() ==
+        continue_url_.ReplaceComponents(replacements).path();
+  const bool original_continue_url_match =
+      google_domain_url &&
+      url.ReplaceComponents(replacements).path() ==
+        original_continue_url_.ReplaceComponents(replacements).path();
+
+  if (continue_url_match)
+    RemoveSigninRedirectURLHistoryItem(contents);
+
+  // If there is no valid email yet, there is nothing to do.  As of M26, the
+  // password is allowed to be empty, since its no longer required to setup
+  // sync.
+  if (email_.empty()) {
+    VLOG(1) << "OneClickSigninHelper::DidStopLoading: nothing to do";
+    // Original-url check done because some user actions cans get us to a page
+    // via a POST instead of a GET (and thus to immediate "cuntinue url") but
+    // we still want redirects from the "blank.html" landing page to work for
+    // non-security related redirects like NTP.
+    // https://code.google.com/p/chromium/issues/detail?id=321938
+    if (original_continue_url_match) {
+      if (auto_accept_ == AUTO_ACCEPT_EXPLICIT)
+        RedirectToSignin();
+      std::string unused_value;
+      if (net::GetValueForKeyInQuery(url, "ntp", &unused_value)) {
+        signin::SetUserSkippedPromo(profile);
+        RedirectToNtpOrAppsPage(web_contents(), source_);
+      }
+    } else {
+      if (!IsValidGaiaSigninRedirectOrResponseURL(url) &&
+          ++untrusted_navigations_since_signin_visit_ > kMaxNavigationsSince) {
+        CleanTransientState();
+      }
+    }
+
+    return;
+  }
+
+  if (!continue_url_match && IsValidGaiaSigninRedirectOrResponseURL(url))
+    return;
+
+  // During an explicit sign in, if the user has not yet reached the final
+  // continue URL, wait for it to arrive. Note that Gaia will add some extra
+  // query parameters to the continue URL.  Ignore them when checking to
+  // see if the user has continued.
+  //
+  // If this is not an explicit sign in, we don't need to check if we landed
+  // on the right continue URL.  This is important because the continue URL
+  // may itself lead to a redirect, which means this function will never see
+  // the continue URL go by.
+  if (auto_accept_ == AUTO_ACCEPT_EXPLICIT) {
+    DCHECK(source_ != signin_metrics::SOURCE_UNKNOWN);
+    if (!continue_url_match) {
+      VLOG(1) << "OneClickSigninHelper::DidStopLoading: invalid url='"
+              << url.spec()
+              << "' expected continue url=" << continue_url_;
+      CleanTransientState();
+      return;
+    }
+
+    // In explicit sign ins, the user may have changed the box
+    // "Let me choose what to sync".  This is reflected as a change in the
+    // source of the continue URL.  Make one last check of the current URL
+    // to see if there is a valid source.  If so, it overrides the
+    // current source.
+    //
+    // If the source was changed to SOURCE_SETTINGS, we want
+    // OneClickSigninSyncStarter to reuse the current tab to display the
+    // advanced configuration.
+    signin_metrics::Source source = signin::GetSourceForPromoURL(url);
+    if (source != source_) {
+      source_ = source;
+      switched_to_advanced_ = source == signin_metrics::SOURCE_SETTINGS;
+    }
+  }
+
+  Browser* browser = chrome::FindBrowserWithWebContents(contents);
+
+  VLOG(1) << "OneClickSigninHelper::DidStopLoading: signin is go."
+          << " auto_accept=" << auto_accept_
+          << " source=" << source_;
+
+  switch (auto_accept_) {
+    case AUTO_ACCEPT_NONE:
+      if (showing_signin_)
+        LogHistogramValue(signin_metrics::HISTOGRAM_DISMISSED);
+      break;
+    case AUTO_ACCEPT_ACCEPTED:
+      LogHistogramValue(signin_metrics::HISTOGRAM_ACCEPTED);
+      LogHistogramValue(signin_metrics::HISTOGRAM_WITH_DEFAULTS);
+      SigninManager::DisableOneClickSignIn(profile->GetPrefs());
+      // Start syncing with the default settings - prompt the user to sign in
+      // first.
+      if (!do_not_start_sync_for_testing_) {
+        StartSync(
+            StartSyncArgs(profile, browser, auto_accept_,
+                          session_index_, email_, password_, "",
+                          NULL  /* don't force sync setup in same tab */,
+                          true  /* confirmation_required */, source_,
+                          OneClickSigninSyncStarter::Callback()),
+            OneClickSigninSyncStarter::SYNC_WITH_DEFAULT_SETTINGS);
+      }
+      break;
+    case AUTO_ACCEPT_CONFIGURE:
+      LogHistogramValue(signin_metrics::HISTOGRAM_ACCEPTED);
+      LogHistogramValue(signin_metrics::HISTOGRAM_WITH_ADVANCED);
+      SigninManager::DisableOneClickSignIn(profile->GetPrefs());
+      // Display the extra confirmation (even in the SAML case) in case this
+      // was an untrusted renderer.
+      if (!do_not_start_sync_for_testing_) {
+        StartSync(
+            StartSyncArgs(profile, browser, auto_accept_,
+                          session_index_, email_, password_, "",
+                          NULL  /* don't force sync setup in same tab */,
+                          true  /* confirmation_required */, source_,
+                          OneClickSigninSyncStarter::Callback()),
+            OneClickSigninSyncStarter::CONFIGURE_SYNC_FIRST);
+      }
+      break;
+    case AUTO_ACCEPT_EXPLICIT: {
+      signin_metrics::Source original_source =
+          signin::GetSourceForPromoURL(original_continue_url_);
+      if (switched_to_advanced_) {
+        LogHistogramValue(signin_metrics::HISTOGRAM_WITH_ADVANCED);
+        LogHistogramValue(signin_metrics::HISTOGRAM_ACCEPTED);
+      } else {
+        LogHistogramValue(signin_metrics::HISTOGRAM_ACCEPTED);
+        LogHistogramValue(signin_metrics::HISTOGRAM_WITH_DEFAULTS);
+      }
+
+      // - If sign in was initiated from the NTP or the hotdog menu, sync with
+      //   default settings.
+      // - If sign in was initiated from the settings page for first time sync
+      //   set up, show the advanced sync settings dialog.
+      // - If sign in was initiated from the settings page due to a re-auth when
+      //   sync was already setup, simply navigate back to the settings page.
+      ProfileSyncService* sync_service =
+          ProfileSyncServiceFactory::GetForProfile(profile);
+      SigninErrorController* error_controller =
+          SigninErrorControllerFactory::GetForProfile(profile);
+
+      OneClickSigninSyncStarter::StartSyncMode start_mode =
+          source_ == signin_metrics::SOURCE_SETTINGS ?
+              (error_controller->HasError() &&
+               sync_service && sync_service->HasSyncSetupCompleted()) ?
+                  OneClickSigninSyncStarter::SHOW_SETTINGS_WITHOUT_CONFIGURE :
+                  OneClickSigninSyncStarter::CONFIGURE_SYNC_FIRST :
+              OneClickSigninSyncStarter::SYNC_WITH_DEFAULT_SETTINGS;
+
+      if (!HandleCrossAccountError(profile, session_index_, email_, password_,
+              "", auto_accept_, source_, start_mode,
+              OneClickSigninSyncStarter::Callback())) {
+        if (!do_not_start_sync_for_testing_) {
+          StartSync(
+              StartSyncArgs(profile, browser, auto_accept_,
+                            session_index_, email_, password_, "",
+                            contents,
+                            untrusted_confirmation_required_, source_,
+                            OneClickSigninSyncStarter::Callback()),
+              start_mode);
+        }
+
+        // If this explicit sign in is not from settings page/webstore, show
+        // the NTP/Apps page after sign in completes. In the case of the
+        // settings page, it will get auto-closed after sync setup. In the case
+        // of webstore, it will redirect back to webstore.
+        RedirectToNtpOrAppsPageIfNecessary(web_contents(), source_);
+      }
+
+      // Observe the sync service if the settings tab requested a gaia sign in,
+      // so that when sign in and sync setup are successful, we can redirect to
+      // the correct URL, or auto-close the gaia sign in tab.
+      if (original_source == signin_metrics::SOURCE_SETTINGS) {
+        // The observer deletes itself once it's done.
+        new OneClickSigninSyncObserver(contents, original_continue_url_);
+      }
+      break;
+    }
+    case AUTO_ACCEPT_REJECTED_FOR_PROFILE:
+      AddEmailToOneClickRejectedList(profile, email_);
+      LogHistogramValue(signin_metrics::HISTOGRAM_REJECTED);
+      break;
+    default:
+      NOTREACHED() << "Invalid auto_accept=" << auto_accept_;
+      break;
+  }
+
+  CleanTransientState();
+}