Implement the gaia captcha state and unlock capability in the sync setup wiza...

chrome/browser/sync/engine/syncapi.h

 // Copyright (c) 2009 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.
 
 // This file defines the "sync API", an interface to the syncer
 // backend that exposes (1) the core functionality of maintaining a consistent
 // local snapshot of a hierarchical object set; (2) a means to transactionally
 // access and modify those objects; (3) a means to control client/server
 // synchronization tasks, namely: pushing local object modifications to a
 // server, pulling nonlocal object modifications from a server to this client,
@@ skipping 504 matching lines @@
   // Returns empty if there is no such username.
   const std::string& GetAuthenticatedUsername();
 
   // Submit credentials to GAIA for verification and start the
   // syncing process on success. On success, both |username| and the obtained
   // auth token are persisted on disk for future re-use.
   // If authentication fails, OnAuthProblem is called on our Observer.
   // The Observer may, in turn, decide to try again with new
   // credentials. Calling this method again is the appropriate course of action
   // to "retry".
-  // |username| and |password| are expected to be owned by the caller.
-  void Authenticate(const char* username, const char* password);
+  // |username|, |password|, and |captcha| are owned by the caller.
+  void Authenticate(const char* username, const char* password,
+                    const char* captcha);
 
   // Adds a listener to be notified of sync events.
   // NOTE: It is OK (in fact, it's probably a good idea) to call this before
   // having received OnInitializationCompleted.
   void SetObserver(Observer* observer);
 
   // Remove the observer set by SetObserver (no op if none was set).
   // Make sure to call this if the Observer set in SetObserver is being
   // destroyed so the SyncManager doesn't potentially dereference garbage.
   void RemoveObserver();
@@ skipping 121 matching lines @@
   // Subclasses should implement to invoke DoWork on |visitor| once on a thread
   // appropriate for data model modifications.
   // While it doesn't hurt, the impl does not need to be re-entrant (for now).
   // Note: |visitor| is owned by caller.
   virtual void CallDoWorkFromModelSafeThreadAndWait(Visitor* visitor) = 0;
 };
 
 }  // namespace sync_api
 
 #endif  // CHROME_BROWSER_SYNC_ENGINE_SYNCAPI_H_