Sync: Support multiple setup UIs.

chrome/browser/sync/profile_sync_service_android.h

Index: chrome/browser/sync/profile_sync_service_android.h
diff --git a/chrome/browser/sync/profile_sync_service_android.h b/chrome/browser/sync/profile_sync_service_android.h
index 45099020c3feb34e237ec9a1acf357a77862b8ad..68bc8547223b71fa893ae3608cb622d9739f7d27 100644
--- a/chrome/browser/sync/profile_sync_service_android.h
+++ b/chrome/browser/sync/profile_sync_service_android.h
@@ -19,6 +19,10 @@
 #include "google/cacheinvalidation/include/types.h"
 #include "google_apis/gaia/google_service_auth_error.h"
 
+namespace sync_driver {
+class SyncSetupInProgressHandle;
+}
+
 class Profile;
 class ProfileSyncService;
 
@@ -191,6 +195,9 @@ class ProfileSyncServiceAndroid : public sync_driver::SyncServiceObserver {
   // A reference to the sync service for this profile.
   ProfileSyncService* sync_service_;
 
+  // Handle preventing Sync from running until configuration is complete.
+  std::unique_ptr<sync_driver::SyncSetupInProgressHandle> setup_handle_;
+
   // The class that handles getting, setting, and persisting sync
   // preferences.
   std::unique_ptr<sync_driver::SyncPrefs> sync_prefs_;