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We are relanding the commit to record ShareAction invocations.
This was previously reverted because we are adding a new enum
to record this metric but did not add the enum to enums.xml.

Original CL: https://crrev.com/c/2537505

Bug: 1148694
Change-Id: I8b6b12eea5aaec5239ceedd99cc9c7d5bbf4cdfa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2554742
Auto-Submit: Melissa Zhang <melzhang@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Commit-Queue: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#830816}