[Sync] Don't start up sync when FirstSetupCompleted is false and no setup in progress

components/sync_driver/startup_controller.h

Index: components/sync_driver/startup_controller.h
diff --git a/components/sync_driver/startup_controller.h b/components/sync_driver/startup_controller.h
index 9ebb9d56834f7a9e6d3cebfbe2bae50cfc7f03ad..350f9931aafa7b4f1d6ad0c95266aac50353fd86 100644
--- a/components/sync_driver/startup_controller.h
+++ b/components/sync_driver/startup_controller.h
@@ -31,6 +31,10 @@ class StartupController {
   // the backend was started.
   bool TryStart();
 
+  // Same as TryStart() above, but bypasses deferred startup and the first setup
+  // complete check.
+  bool TryStartImmediately();
+
   // Called when a datatype (SyncableService) has a need for sync to start
   // ASAP, presumably because a local change event has occurred but we're
   // still in deferred start mode, meaning the SyncableService hasn't been
@@ -67,6 +71,10 @@ class StartupController {
   // Records time spent in deferred state with UMA histograms.
   void RecordTimeDeferred();
 
+  // If true, will bypass the FirstSetupComplete check when triggering sync
+  // startup.
+  bool bypass_setup_complete_;
+
   // True if we should start sync ASAP because either a SyncableService has
   // requested it, or we're done waiting for a sign and decided to go ahead.
   bool received_start_request_;