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Adds a new metric for each API call made from SecureChannel to the
Nearby Connections library. Because values will now be used in metrics,
this CL also adds explicit numeric values to
nearby_connection_types.mojom.

Fixed: 1163979
Bug: 1106937
Change-Id: I15ddd5861cc22dce109970de0bea46e9adae043c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2617045Reviewed-by: Ryan Hansberry <hansberry@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Ryan Hansberry <hansberry@chromium.org>
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Auto-Submit: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#841770}