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Also ensure members are initialized so the move constructor doesn't use
uninitialized values.

Bug: 871604
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: I9ab800fec100ccf7ec4de3dd63dfcd28b1e5c5df
Reviewed-on: https://chromium-review.googlesource.com/1178302Reviewed-by: Min Qin <qinmin@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Bo <boliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584623}