Implemented EGL_EXT_platform_base and EGL_KHR_platform_gbm. BUG=18314459 Change-Id: I361dba91a2fec3d9c923c660e64b5cc25beeb72b Reviewed-on: https://swiftshader-review.googlesource.com/1421 Reviewed-by: Nicolas Capens <nicolascapens@google.com> Tested-by: Nicolas Capens <nicolascapens@google.com>