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This change adds a new base/functional/ folder and moves base::invoke
and base::identity from base/stl_util.h to the new location.

Bug: None
Change-Id: I98cb577b5154561c82d41bfb7dc23e0ff9abee27
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2494923
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822124}