Export a private webstore API to call into the new inline sign-in flow.

chrome/browser/ui/sync/one_click_signin_sync_starter.h

Index: chrome/browser/ui/sync/one_click_signin_sync_starter.h
diff --git a/chrome/browser/ui/sync/one_click_signin_sync_starter.h b/chrome/browser/ui/sync/one_click_signin_sync_starter.h
index e89fad0c1adba3050fb1950d91dad9d8e3a97109..17e465286226aeee842be42c116c53f95508908f 100644
--- a/chrome/browser/ui/sync/one_click_signin_sync_starter.h
+++ b/chrome/browser/ui/sync/one_click_signin_sync_starter.h
@@ -78,6 +78,9 @@ class OneClickSigninSyncStarter : public SigninTracker::Observer,
   // signin before signin completes.
   // |web_contents| is used to show the sync UI if it's showing a blank page
   // and not about to be closed. It can be NULL.
+  // If |web_contents| is non-NULL and the |continue_url| is non-empty, the
+  // |web_contents| will be navigated to the |continue_url| once both signin and
+  // Sync setup are complete.
   // |callback| is always executed before OneClickSigninSyncStarter is deleted.
   // It can be empty.
   OneClickSigninSyncStarter(Profile* profile,
@@ -88,6 +91,7 @@ class OneClickSigninSyncStarter : public SigninTracker::Observer,
                             StartSyncMode start_mode,
                             content::WebContents* web_contents,
                             ConfirmationRequired display_confirmation,
+                            const GURL& continue_url,
                             Callback callback);
 
   // chrome::BrowserListObserver override.
@@ -209,6 +213,7 @@ class OneClickSigninSyncStarter : public SigninTracker::Observer,
   chrome::HostDesktopType desktop_type_;
   bool force_same_tab_navigation_;
   ConfirmationRequired confirmation_required_;
+  GURL continue_url_;
 
   // Callback executed when sync setup succeeds or fails.
   Callback sync_setup_completed_callback_;