This is the GLESv2 on top of openGL implementation on the host
most of this change is moving code which is necessary by both
GLES 1.0 and GLES 2.0 implementations from GLES_CM folder into
GLcommon folder.
GLESv2Imp - includes GLES 2.0 entry points implementation
Change-Id: I934fb963478a7f596d824612f847a5aa77d2ed9d