Add shend and myy to ui_chromeos_strings_grdp folder OWNER

Bug: None
Change-Id: I21a97767ac8d7d5e8f4ce677805c32e98bbf7f05
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2524803Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: My Nguyen <myy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825459}

ui/chromeos/ui_chromeos_strings_grd/OWNERS

+# For input-related naming change
+myy@chromium.org
+shend@chromium.org
\ No newline at end of file