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For the multiple touch points case, if we have one point move and the
other point stay still, such as
point 1: pointerdown, pointermove, pointerup
point 2: pointerdown, pause, pointerup
We should send five touch point events of "pointerdown", "pointerdown",
"pointermove", "pointerup", "pointerup" with pointer id 1, 2, 1, 1, 2.


Bug: 1020674
Change-Id: I2a738154fee5a4356b64467fd9483c69429217d6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1895861Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: Lan Wei <lanwei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712684}