Add # COMPONENT: Internals>Printing>CUPS

See https://tinyurl.com/yxau5sc4 for context.

Bug: 977050
Change-Id: If866de2f5590eada52b2198c751d0ecdc8e271e5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1808308
Auto-Submit: Eric Foo <efoo@chromium.org>
Reviewed-by: Sean Kau <skau@chromium.org>
Commit-Queue: Eric Foo <efoo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698711}

third_party/libipp/OWNERS

 pawliczek@chromium.org
 skau@chromium.org
+
+# COMPONENT: Internals>Printing>CUPS