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This CL implements 3 histograms for the phone connected screen:
  * Ash.PhoneHub.NotificationOptInEvents
  * Ash.PhoneHub.QuickActionResult.*
  * Ash.PhoneHub.TabContinuationChipClicked

BUG=1138137,1106937

Change-Id: Ic6cb37d5dd5208a09dee1249540c8f3c877be3a8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2491243Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: Tim Song <tengs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821408}