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This means that we render the real app when ChromeOS,
and the mock html and JS when not (for testing).

Bug: 1012578, b/144121590
Change-Id: I282b39343c110da0482481f1569ad05a57e2f736
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1930360
Commit-Queue: Rachel Carpenter <carpenterr@google.com>
Reviewed-by: Samuel Huang <huangs@chromium.org>
Reviewed-by: Ryo Hashimoto <hashimoto@chromium.org>
Reviewed-by: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720848}