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Change --output-dir flag to --out-dir
Make --out-dir a mandatory flag, but allow it to be set automatically in gpu integration tests.

Bug: 1080854
Change-Id: I2ee9e96edc3d0b0a5514ee8d2cee179400142e49
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2386430Reviewed-by: Robert Ma <robertma@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Commit-Queue: Chong Gu <chonggu@google.com>
Auto-Submit: Chong Gu <chonggu@google.com>
Cr-Commit-Position: refs/heads/master@{#806932}