[Sync] Start up immediately when entering the sync setup UI.

components/sync_driver/startup_controller.cc

Index: components/sync_driver/startup_controller.cc
diff --git a/components/sync_driver/startup_controller.cc b/components/sync_driver/startup_controller.cc
index a8ae9419bbc1fda307597a0d0987f2d615851e88..631cdcce3466a2e60ab2bad542f0b951427be415 100644
--- a/components/sync_driver/startup_controller.cc
+++ b/components/sync_driver/startup_controller.cc
@@ -78,8 +78,11 @@ void StartupController::Reset(const syncer::ModelTypeSet registered_types) {
   registered_types_ = registered_types;
 }
 
-void StartupController::set_setup_in_progress(bool in_progress) {
-  setup_in_progress_ = in_progress;
+void StartupController::SetSetupInProgress(bool setup_in_progress) {
+  setup_in_progress_ = setup_in_progress;
+  if (setup_in_progress_) {
+    TryStart();

[Nicolas Zea, 2016/03/14 22:42:01]

What happens if Chrome is already started? Can this have any negative effects?

[maxbogue, 2016/03/15 17:41:01]

Assuming you meant s/Chrome/sync, no, it will not do anything. The
|start_backend_time_| value acts as a barrier to StartupController starting sync
more than once before being reset.

[Nicolas Zea, 2016/03/15 18:16:14]

Acknowledged.

+  }
 }
 
 bool StartupController::StartUp(StartUpDeferredOption deferred_option) {