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This collects metrics for the length of phone numbers and the number of
digits in them. These are collected when shown to the user and when the
user actually selects a device to send that number to a device. We also
distinguish between the entry points of right and left click on links
and text selections.

The new metric name is built like this:
Sharing.ClickToCallPhoneNumber{Length,Digits}.
  {LeftClickLink,RightClickLink,RightClickSelection}.
  {Sending,Showing}

Bug: 1001033
Change-Id: I59ed705170153b8adcbe00021cedb5118f1cf27b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1878198Reviewed-by: Ilya Sherman <isherman@chromium.org>
Reviewed-by: David Jacobo <djacobo@chromium.org>
Reviewed-by: Michael van Ouwerkerk <mvanouwerkerk@chromium.org>
Commit-Queue: Richard Knoll <knollr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709400}