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The flag indicates if IIO Service is running in ChromeOS, which
determines sensor clients to use Mojo implementations or not.

BUG=b:173485266, b:168434557, b:172414302

Change-Id: Ib89dea49b03671e9ba36f19720c30e6035521731
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2624327
Commit-Queue: Cheng-Hao Yang <chenghaoyang@chromium.org>
Reviewed-by: Ryo Hashimoto <hashimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843397}