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In ChromeDriver PerformAction API, we used to release all the touch
points all once, because Devtool Input.dispatchTouchEvent API's
touchEnd event will release all the touch points.
https://chromedevtools.github.io/devtools-protocol/tot/
Input#method-dispatchTouchEvent

In order to just release one touch point, we have to send touchMove event
excluding the touch point we want to release from touch points list, so
Devtool Input.dispatchTouchEvent will send a pointerup event for this
touch point.

Bug: 1020674
Change-Id: Iba44ef480284b44f914378374bc14d63cf66a5c0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1958163Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: Lan Wei <lanwei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#723137}