Load sync token upon login

chrome/browser/chromeos/login/user_flow.h

Index: chrome/browser/chromeos/login/user_flow.h
diff --git a/chrome/browser/chromeos/login/user_flow.h b/chrome/browser/chromeos/login/user_flow.h
index c8a93f3eeeb3143026cc5c1673f76c5aa397bab4..1a0ed34b88e3000ce24251aa76bf2b4085dfb2dc 100644
--- a/chrome/browser/chromeos/login/user_flow.h
+++ b/chrome/browser/chromeos/login/user_flow.h
@@ -7,6 +7,7 @@
 
 #include "base/compiler_specific.h"
 #include "chrome/browser/chromeos/login/login_status_consumer.h"
+#include "chrome/browser/profiles/profile.h"
 
 namespace chromeos {
 
@@ -21,7 +22,7 @@ class UserFlow {
   virtual bool HandleLoginFailure(const LoginFailure& failure,
       LoginDisplayHost* host) = 0;
   virtual bool HandlePasswordChangeDetected(LoginDisplayHost* host) = 0;
-  virtual void LaunchExtraSteps(LoginDisplayHost* host) = 0;
+  virtual void LaunchExtraSteps(Profile* profile, LoginDisplayHost* host) = 0;
 };
 
 // UserFlow implementation for regular login flow.
@@ -34,7 +35,25 @@ class DefaultUserFlow : public UserFlow {
   virtual bool HandleLoginFailure(const LoginFailure& failure,
       LoginDisplayHost* host) OVERRIDE;
   virtual bool HandlePasswordChangeDetected(LoginDisplayHost* host) OVERRIDE;
-  virtual void LaunchExtraSteps(LoginDisplayHost* host) OVERRIDE;
+  virtual void LaunchExtraSteps(Profile* profile,
+      LoginDisplayHost* host) OVERRIDE;
+};
+
+// UserFlow stub for non-regular flows.
+class ExtendedUserFlow : public UserFlow {
+ public:
+  explicit ExtendedUserFlow(const std::string& user_id);
+  virtual ~ExtendedUserFlow();
+
+ protected:
+  // Subclasses can call this method to unregister flow in the next event.
+  virtual void UnregisterFlowSoon();
+  std::string user_id() {
+    return user_id_;
+  };
+
+ private:
+  std::string user_id_;
 };
 
 }  // namespace chromeos