When a user logs into sync, the appropriate cookies are retrieved so that

chrome/browser/sync/signin_manager.h

Index: chrome/browser/sync/signin_manager.h
===================================================================
--- chrome/browser/sync/signin_manager.h	(revision 88668)
+++ chrome/browser/sync/signin_manager.h	(working copy)
@@ -16,6 +16,8 @@
 #include "base/memory/scoped_ptr.h"
 #include "chrome/common/net/gaia/gaia_auth_consumer.h"
 #include "chrome/common/net/gaia/google_service_auth_error.h"
+#include "content/common/notification_observer.h"
+#include "content/common/notification_registrar.h"
 
 class GaiaAuthFetcher;
 class Profile;
@@ -33,7 +35,13 @@
   std::string password;
 };
 
+#if !defined(OS_CHROMEOS)
+class SigninManager : public GaiaAuthConsumer ,
+                      public NotificationObserver {
+#else
 class SigninManager : public GaiaAuthConsumer {
+#endif
+
  public:
   SigninManager();
   virtual ~SigninManager();
@@ -75,6 +83,13 @@
   virtual void OnGetUserInfoKeyNotFound(const std::string& key);
   virtual void OnGetUserInfoFailure(const GoogleServiceAuthError& error);
 
+#if !defined(OS_CHROMEOS)

[tim (not reviewing), 2011/06/14 13:18:29]

maybe we should create a const in browser/defaults.h instead of ifdefing
everywhere here? 

[Roger Tawa OOO till Jul 10th, 2011/06/14 18:42:43]

I don't want to compile any of this code in the case of chromeos.  Maybe I don't
understand your request?

+  // NotificationObserver
+  virtual void Observe(NotificationType type,
+                       const NotificationSource& source,
+                       const NotificationDetails& details);
+#endif
+
  private:
   Profile* profile_;
   std::string username_;
@@ -87,6 +102,11 @@
 
   // Actual client login handler.
   scoped_ptr<GaiaAuthFetcher> client_login_;
+
+#if !defined(OS_CHROMEOS)
+  // Register for notifications from the TokenService.
+  NotificationRegistrar registrar_;
+#endif
 };
 
 #endif  // CHROME_BROWSER_SYNC_SIGNIN_MANAGER_H_