graphics_*: Set label Cr-OS-Kernel-Graphics when autofiling.

When a new bug is filled as untriaged, add the right Cr- flag so
the owners can watch for new failures.

BUG=chromium:402142
TEST=None

Change-Id: Iff2cf152218dfb58360a8a00357d343ddaa034d2
Reviewed-on: https://chromium-review.googlesource.com/211750
Reviewed-by: Ilja Friedel <ihf@chromium.org>
Commit-Queue: Alex Deymo <deymo@chromium.org>
Tested-by: Alex Deymo <deymo@chromium.org>
20 files changed