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This patch is a work-around for WM_TOUCH vintage drivers that sometimes
drop touchend events, confusing the chromium gesture recognizer. The
work around is to watch for touches that have disappeared from the
current touch list (and inject a simulated touchend).

Bug: 792892
Change-Id: I7e023fc4f6484e2091746e0000b41018dd8f9cb4
Reviewed-on: https://chromium-review.googlesource.com/905270
Commit-Queue: Eugene Girard <girard@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#539137}