Temporarily disable mip generation to investigate mem regression

This patch may have been leading to regressions in memory on Windows.
Temporarily disabling mip map generation to test whether this is the
culprit.

R=khushalsagar

Bug: 867468
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I74467e2f620ecb15af86a6a82c6b772d03c739d1
Reviewed-on: https://chromium-review.googlesource.com/1157273
Reviewed-by: Khushal <khushalsagar@chromium.org>
Commit-Queue: Eric Karl <ericrk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579657}
2 files changed