Fix pawn on pre-annotation and keypress

modules/ve/ce/ve.ce.SurfaceObserver.js
* pollOnceNoEmit method to update SurfaceObserver's benchmark text

modules/ve/ce/ve.ce.Surface.js
* pollOnceNoEmit from onUnlock

Change-Id: Idb14a6aea723c42109b3825478766799d4abef22