Use testdriver Action API in WPT pointerevent touch tests

In order to run the web-platform-tests automatically, we will use
testdriver Action API in all the wpt to simulate inputs. Here we are
changing some pointerevent touch input tests which are doing scrolling.

Bug: 606367
Change-Id: Ibdabcbb973ac641174ca6faadccd737fa8c678b4
Reviewed-on: https://chromium-review.googlesource.com/c/1461504
Reviewed-by: Navid Zolghadr <nzolghadr@chromium.org>
Commit-Queue: Lan Wei <lanwei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#632251}
18 files changed