Implement support for disabling sync through configuration management.

chrome/browser/sync/profile_sync_service.h

Index: chrome/browser/sync/profile_sync_service.h
diff --git a/chrome/browser/sync/profile_sync_service.h b/chrome/browser/sync/profile_sync_service.h
index 14db31e14463401f462c64abe0a2dec4172296eb..2465b3708ef25ccde4092dbce6d94a1a602b3899 100644
--- a/chrome/browser/sync/profile_sync_service.h
+++ b/chrome/browser/sync/profile_sync_service.h
@@ -14,10 +14,12 @@
 #include "base/scoped_ptr.h"
 #include "base/time.h"
 #include "chrome/browser/google_service_auth_error.h"
+#include "chrome/browser/pref_member.h"
 #include "chrome/browser/sync/glue/data_type_controller.h"
 #include "chrome/browser/sync/glue/data_type_manager.h"
 #include "chrome/browser/sync/glue/sync_backend_host.h"
 #include "chrome/browser/sync/notification_method.h"
+#include "chrome/browser/sync/profile_sync_service_observer.h"
 #include "chrome/browser/sync/sync_setup_wizard.h"
 #include "chrome/browser/sync/syncable/model_type.h"
 #include "chrome/browser/sync/unrecoverable_error_handler.h"
@@ -31,21 +33,6 @@ class NotificationType;
 class Profile;
 class ProfileSyncFactory;
 
-// Various UI components such as the New Tab page can be driven by observing
-// the ProfileSyncService through this interface.
-class ProfileSyncServiceObserver {
- public:
-  // When one of the following events occurs, OnStateChanged() is called.
-  // Observers should query the service to determine what happened.
-  // - We initialized successfully.
-  // - There was an authentication error and the user needs to reauthenticate.
-  // - The sync servers are unavailable at this time.
-  // - Credentials are now in flight for authentication.
-  virtual void OnStateChanged() = 0;
- protected:
-  virtual ~ProfileSyncServiceObserver() { }
-};
-
 // ProfileSyncService is the layer between browser subsystems like bookmarks,
 // and the sync backend.  Each subsystem is logically thought of as being
 // a sync datatype.
@@ -257,6 +244,10 @@ class ProfileSyncService : public browser_sync::SyncFrontend,
   // command-line switches).
   static bool IsSyncEnabled();
 
+  // Retuns whether sync is managed, i.e. controlled by configuration
+  // management. If so, the user is not allowed to configure sync.
+  bool IsManaged();
+
   // UnrecoverableErrorHandler implementation.
   virtual void OnUnrecoverableError(
       const tracked_objects::Location& from_here,
@@ -445,6 +436,10 @@ class ProfileSyncService : public browser_sync::SyncFrontend,
   ScopedRunnableMethodFactory<ProfileSyncService>
     scoped_runnable_method_factory_;
 
+  // The preference that controls whether sync is under control by configuration
+  // management.
+  BooleanPrefMember pref_sync_managed_;
+
   DISALLOW_COPY_AND_ASSIGN(ProfileSyncService);
 };