Clipboard: Add huangdarwin@ and dcheng@ as OWNERS for mojo hosts.

Change-Id: I43fd98349c7f049b650615d2f06ea0d071f88689
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2444069Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Darwin Huang <huangdarwin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813310}

content/browser/renderer_host/OWNERS

@@ -42,6 +42,10 @@ per-file dwrite_*=drott@chromium.org
 # BackForwardCache.
 per-file back_forward_cache*=altimin@chromium.org
 
+# Clipboard
+per-file *clipboard_host_impl*=huangdarwin@chromium.org
+per-file *clipboard_host_impl*=dcheng@chromium.org
+
 # AgentSchedulingGroup (MBI)
 per-file agent_scheduling_group*=talp@chromium.org
 per-file agent_scheduling_group*=kouhei@chromium.org