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Creation of the 'MobileSingleScreenScreenshot' metric and its collection when a user takes a screenshot of a single screen.

Change-Id: Ib95e031a36f922450f602e6fdfb7ccf14928cf76
Bug: 1065909
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2218552Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Reviewed-by: Sebastien Lalancette <seblalancette@chromium.org>
Commit-Queue: Julian Mentasti-Meza <jmentasti@google.com>
Cr-Commit-Position: refs/heads/master@{#780918}