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Tested with the following configs:

Linux:
$ gn gen out_gn/Debug
$ gn check out_gn/Debug

Android:
$ gn gen --args='os="android" cpu_arch="arm"' out_gn_android/Debug
$ gn check out_gn_android/Debug

Chromeos:
$ gn gen --args='os="chromeos"' out_gn_chromeos/Debug
$ gn check out_gn_chromeos/Debug

BUG=367595, 376000
TEST=see above
R=brettw@chromium.org
TBR=sky@chromium.org

Review URL: https://codereview.chromium.org/872243004

Cr-Commit-Position: refs/heads/master@{#314102}