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This change makes the max timeout, after which DarkResumeController
notifies the  power daemon that it's okay to resuspend, configurable.
This is needed for upcoming boards that need to do more work in dark
resume and will set the command line option added in this change.

BUG=924762
TEST=Unit tests.

Change-Id: I658f4c77d2e6dd3a4391fb60971447426875600d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1649035
Commit-Queue: Abhishek Bhardwaj <abhishekbh@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#688274}