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This stat will be used by the team working on the WebUI
tab strip to determine how much of a real world problem
failure of touch drag of tabs in the tab strip is.

Failure is detected by ::DoDragDrop blocking for more than one second
and only calling QueryContinueDrag once.

Bug: 1126230
Change-Id: I75b9d3a95912b8ef2ec049fcd32ed4700e4ca51d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2437485
Commit-Queue: David Bienvenu <davidbienvenu@chromium.org>
Reviewed-by: Peter Boström <pbos@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812685}