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This histogram tracks the time from all wheel events to when the
swap begins for the resulting frame. However, we typically only look at
the more specific
Event.Latency.Scroll(Begin|Update).Wheel.TimeToScrollUpdateSwapBegin4
metrics which reflect the same values.

Bug: 1081296
Change-Id: Ibd1fd7dd684c31405d4cbdad98216ca82553d760
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2627765
Commit-Queue: Robert Flack <flackr@chromium.org>
Reviewed-by: Mustaq Ahmed <mustaq@chromium.org>
Reviewed-by: Caitlin Fischer <caitlinfischer@google.com>
Cr-Commit-Position: refs/heads/master@{#845264}