Enable texelFetchOffset re-writing for GLSL translator Intel Mac has the same bug as Win. So the CL enables it in GLSL translator as well. BUG=chromium:642605 TEST=deqp/functional/gles3/shadertexturefunction/texelfetchoffset.html Change-Id: I30323ea3a6d4c07ff32e50bd7c574916b5b865f4 Reviewed-on: https://chromium-review.googlesource.com/378601 Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Corentin Wallez <cwallez@chromium.org> Commit-Queue: Corentin Wallez <cwallez@chromium.org>