Bug 1080051 - [FTE] Tapping on the SIM 1 PIN text box does not invoke the keyboard 

https://bugzilla.mozilla.org/show_bug.cgi?id=1080051
Calling appWindow.blur is not fast enough if user turn off screen and turn on it in 1~2 seconds, we might see the keyboard is still in transitioning when screen is on and it might cause below issue. 
https://bugzilla.mozilla.org/show_bug.cgi?id=1064648