Move more draw call validation to the API. The GL expects us to reject invalid draw calls before we start doing any work, so we can prevent internal unnecessary state changes. Also update the program binary's cached sampler data when we validate. The previous patch was breaking draw calls in Google Earth WebGL. BUG=angle:571 BUG=390412 Change-Id: I1c4e204ae2467afc36b76af975a3a49e26349639 Reviewed-on: https://chromium-review.googlesource.com/206482 Tested-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org>