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PM wants these to measure usefulness of clipboard history.

More consecutive copies or pastes  should mean users are using
multipaste more.

Bug: 1145445
Change-Id: I4d6cecb618e8e95f9438a44e8824aa23fbc5e89f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2613350
Commit-Queue: Alex Newcomer <newcomer@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Reviewed-by: Weilun Shi <sweilun@chromium.org>
Reviewed-by: Andrew Xu <andrewxu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842298}