[Devtool] Add pointerevent's properties to Devtool Input protocol

The pointerevent' spec has properties e.g. width, height, pressure...,
so we are working on adding the pointerevent's properties to Webdriver
Action API to simulate the inputs from devices such as touchscreen and
stylus, which have these additional properties. This CL adds these
properties to ChromeDriver's ExecutePerformActions. This CL adds these
properties to Devtool Input protocol's DispatchMouseEvent and TouchPoint.


Bug: 1139172
Change-Id: I75f3d08491ffb9719340f327268d952bedf1ad80
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2477049


Reviewed-by: John Chen <johnchen@chromium.org>
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Commit-Queue: Lan Wei <lanwei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820063}