no need to swap buffers in the offscreen rendering

Change-Id: Ibe25afaa71acc0a0c8995c6f0644eb08fe8920cf
OSL_TRACE to SAL_INFO in opengl code

Change-Id: I7bdefec1cf941d1a51b7777639c0979387e1b436
remove file

Change-Id: I74d1116ae0d5f99bcfbbe67ec1ecbe1a5a89ad8f