Add "# COMPONENT" to OWNERS

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

Bug: 977050
Change-Id: If87e32552f4ffb9fbfb9eb5b4fec918a4d4e694b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1808302Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Eric Foo <efoo@chromium.org>
Auto-Submit: Eric Foo <efoo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698540}

components/strings/OWNERS

@@ -3,3 +3,5 @@
 # be discussed with blink-api-owners-discuss@ first or go through the
 # official Blink launch process.
 per-file components_locale_settings_*.xtb=file://third_party/blink/API_OWNERS
+
+# COMPONENT: Internals

third_party/ashmem/OWNERS

 digit@chromium.org
+
+# COMPONENT: Internals>Core