GitLab

Add sameSite to AddCookie command, but do not include in DevTools parameters if not set by user.
Add sameSite to GetCookie commands.

Bug: chromedriver:3264
Change-Id: Iefb02e131804bdf7235bdb98b5ebf38e7a886cfc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1955793
Commit-Queue: Tricia Crichton <triciac@chromium.org>
Reviewed-by: John Chen <johnchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#722581}