[GM2] Take pixel offsets into account when drawing toolbar top stroke

BUG=877647
R=pkasting

Change-Id: I37b7d06209890a59262b0363c30fc70e809329ed
Reviewed-on: https://chromium-review.googlesource.com/1194674
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Allen Bauer <kylixrd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592904}
11 files changed