No vsync handling.
This code is not using any eglSwapInterval call. This is wrong since the EGL doc doesn't mention any default setting.
On Tegra2 libs, default setting is eglSwapInterval = 1, meaning wait for vsync, which is stupid for a benchmark (seriously.).
I don't know much of EGL, so I don't know where the eglSwapInterval
I guess this might also be a SDL_gles bug.