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Provides a global public metadata interface for setting metadata on
already-recorded samples in active profiles.

Routes the metadata setting via global functions in sample_metadata.h to
provide consistency with the existing interface for setting metadata.

Bug: 1034758
Change-Id: Ie7677efb976a8a035e9bbcf689abe98ad64cf225
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2036561
Commit-Queue: Mike Wittman <wittman@chromium.org>
Reviewed-by: Etienne Pierre-Doray <etiennep@chromium.org>
Cr-Commit-Position: refs/heads/master@{#742181}