heap: Add omerkatz@ as GC and GC plugin owner

Change-Id: I0235e805063ee1c89cb6f558a2454b3d2ca24177
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2059973Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Anton Bikineev <bikineev@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Omer Katz <omerkatz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#742063}

third_party/blink/renderer/platform/heap/OWNERS

@@ -2,6 +2,7 @@ bikineev@chromium.org
 haraken@chromium.org
 kouhei@chromium.org
 mlippautz@chromium.org
+omerkatz@chromium.org
 
 # TEAM: oilpan-reviews@chromium.org
 # COMPONENT: Blink>MemoryAllocator>GarbageCollection

tools/clang/blink_gc_plugin/OWNERS

@@ -2,6 +2,7 @@ bikineev@chromium.org
 haraken@chromium.org
 kouhei@chromium.org
 mlippautz@chromium.org
+omerkatz@chromium.org
 tkent@chromium.org
 
 # TEAM: oilpan-reviews@chromium.org