Don't block while waiting initialization

Author: nvborisenko

dotnet/src/webdriver/DriverService.cs

@@ -256,13 +256,15 @@ public void Start()
         this.OnDriverProcessStarting(eventArgs);
 
         this.driverServiceProcess.Start();
-        bool serviceAvailable = this.WaitForServiceInitialization();
-        DriverProcessStartedEventArgs processStartedEventArgs = new DriverProcessStartedEventArgs(this.driverServiceProcess);
-        this.OnDriverProcessStarted(processStartedEventArgs);
 
         this.driverServiceProcess.BeginOutputReadLine();
         this.driverServiceProcess.BeginErrorReadLine();
 
+        bool serviceAvailable = this.WaitForServiceInitialization();
+
+        DriverProcessStartedEventArgs processStartedEventArgs = new DriverProcessStartedEventArgs(this.driverServiceProcess);
+        this.OnDriverProcessStarted(processStartedEventArgs);
+
         if (!serviceAvailable)
         {
             throw new WebDriverException($"Cannot start the driver service on {this.ServiceUrl}");