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Right now, we are dispatch touch events one touch point by one touch
point to Devtool input protocol, but Devtool does not group them
together as one touch event. Therefore, when we send touch events to
Devtool we need to group all the touch points into one touch event and
then send to Devtool.

Bug: 999982
Change-Id: I11a85625ede0651b920d732a4e1006292f8be0a8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1838138Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: Lan Wei <lanwei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702612}