Add Component: Blink>PresentationAPI

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

Bug: 977050
Change-Id: I980489adbce321402af8d6ce93009af1c38ecf6f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1815991Reviewed-by: Brandon Tolsch <btolsch@chromium.org>
Commit-Queue: Brandon Tolsch <btolsch@chromium.org>
Auto-Submit: Eric Foo <efoo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#700062}

third_party/openscreen/OWNERS

 mfoltz@chromium.org
 btolsch@chromium.org
 pthatcher@chromium.org
+
+# COMPONENT: Blink>PresentationAPI