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This extends the histogram Event.SingleTapType so that we can monitor
changes as we attempt to reduce the number of sites which have double
tap to zoom enabled.

Bug: 1088745
Change-Id: Ife06d0a4763924a3872754fdebbff63ad83abca0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2629867Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Robert Flack <flackr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845217}