Since libGLESv2 and libEGL will eventually be cross platform, it will be useful to have platform defines and TLS functions that work everywhere. BUG=angle:664 Change-Id: Ia357925a0992d82e8b446d88d32a1984d319e6e8 Reviewed-on: https://chromium-review.googlesource.com/202133Reviewed-by: Jamie Madill <jmadill@chromium.org> Tested-by: Geoff Lang <geofflang@chromium.org>
