Add Pixel 2 XL to waterfall

Bug: skia:7249
NOTRY=true
Change-Id: I877c8aa40c4529fdf7ae98b61e5742b93ce78c70
Reviewed-on: https://skia-review.googlesource.com/65821
Reviewed-by: Eric Boren <borenet@google.com>
Commit-Queue: Kevin Lubick <kjlubick@google.com>
3 files changed