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The paths are specified as initializer lists to avoid parsing them. We will
likely need to add on a different capability to support callers that have
only dynamic paths, but I think we will want to support this format
either way.

Updates flat_set and flat_map documentation with a missing function.

Bug: 646113
Change-Id: I105b958afa7c514147f259c6be1e3608518d7734
Reviewed-on: https://chromium-review.googlesource.com/589779
Commit-Queue: Brett Wilson <brettw@chromium.org>
Reviewed-by: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491563}