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BUG=chromium:834170
TEST=VDA/VEA/JDA/JEA unittest built scueessfully for Chrome OS on both x86 and
ARM platforms
TEST=made sure for other platforms by CQ

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: I480220047ac23e4c26ee4dfff0ac2ef3bac70f6b
Reviewed-on: https://chromium-review.googlesource.com/1016222Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553924}