opengles emulator: object name manager name generation

genName in the globalNameSpace now calls the glGen* function of opengl
to generate a global name instead of inventing one.
this is to overcome a bug in intel driver which raises glError when
binding a framebuffer/renderbuffer with a name that was not generated
by opengl.

Change-Id: Ia0c2fefbf3538c185c380ba62d74eb94f2b28254
2 files changed