Implement EGL_KHR_gl_texture_2D_image support. BUG=14610416 Change-Id: I78b958709f92bf41a15a8e85260d09de9c2385e1 Reviewed-on: https://swiftshader-review.googlesource.com/1051 Reviewed-by: Nicolas Capens <nicolascapens@google.com>