[sync] Add a polling mechanism to CredentialCacheService for on-the-fly sign in / sign out / reconf…

chrome/browser/sync/credential_cache_service_win.h

Index: chrome/browser/sync/credential_cache_service_win.h
diff --git a/chrome/browser/sync/credential_cache_service_win.h b/chrome/browser/sync/credential_cache_service_win.h
index bd584ef9822816643924be8ef5219a20627c68c8..990bb8e5bfbf35c3813d755e332c1c6188f6448a 100644
--- a/chrome/browser/sync/credential_cache_service_win.h
+++ b/chrome/browser/sync/credential_cache_service_win.h
@@ -144,14 +144,50 @@ class CredentialCacheService : public ProfileKeyedService,
   // ApplyCachedCredentials if the load was successful.
   void ReadCachedCredentialsFromAlternateProfile();
 
-  // Applies the credentials read from the alternate profile to the PrefStore
-  // and TokenService of the local profile and then notifies listeners.
-  void ApplyCachedCredentials(const std::string& google_services_username,
-                              const std::string& lsid,
-                              const std::string& sid,
-                              const std::string& encryption_bootstrap_token,
-                              bool keep_everything_synced,
-                              const bool datatype_prefs[]);
+  // Initiates sync sign in using credentials read from the alternate profile by
+  // persisting |google_services_username|, |encryption_bootstrap_token|,
+  // |keep_everything_synced| and |preferred_types| to the local pref store, and
+  // preparing ProfileSyncService for sign in.
+  void InitiateSignInWithCachedCredentials(
+      const std::string& google_services_username,
+      const std::string& encryption_bootstrap_token,
+      bool keep_everything_synced,
+      ModelTypeSet preferred_types);
+
+  // Updates the TokenService credentials with |lsid| and |sid| and triggers the
+  // minting of new tokens for all Chrome services. ProfileSyncService is
+  // automatically notified when tokens are minted, and goes on to consume the
+  // updated credentials.
+  void UpdateTokenServiceCredentials(const std::string& lsid,
+                                     const std::string& sid);
+
+  // Initiates a sign out of sync. Called when we notice that the user has
+  // signed out from the alternate mode by reading its credential cache.
+  void InitiateSignOut();
+
+  // Compares the sync preferences in the local profile with values that were
+  // read from the alternate profile -- |keep_everything_synced| and
+  // |preferred_types|. Returns true if the prefs have changed, and false
+  // otherwise.
+  bool HaveSyncPrefsChanged(bool keep_everything_synced,
+                            const ModelTypeSet& preferred_types) const;
+
+  // Compares the token service credentials in the local profile with values
+  // that were read from the alternate profile -- |lsid| and |sid|. Returns true
+  // if the credentials have changed, and false otherwise.
+  bool HaveTokenServiceCredentialsChanged(const std::string& lsid,
+                                          const std::string& sid);
+
+  // Determines if sync settings may be reconfigured or not. Called when
+  // updated settings are noticed in the alternate credential cache for
+  // |google_services_username|. Returns true if we may reconfigure, and false
+  // if not.
+  bool CredentialCacheService::MayReconfigureSync(
+      const std::string& google_services_username);
+
+  // Resets |alternate_store_| and schedules the next read from the alternate
+  // credential cache.
+  void ScheduleNextReadFromAlternateCredentialCache();
 
   // Profile for which credentials are being cached.
   Profile* profile_;