Add hiroh@ to media/gpu/OWNERS and components/arc/video_accelerator/OWNERS file

BUG=None
TEST=None

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: Ic3da9a693f8770e4d81b13177df67f94d934c5fc
Reviewed-on: https://chromium-review.googlesource.com/c/1248281Reviewed-by: Pawel Osciak <posciak@chromium.org>
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600263}

components/arc/video_accelerator/OWNERS

+hiroh@chromium.org
 kcwu@chromium.org
 piman@chromium.org
 posciak@chromium.org

media/gpu/OWNERS

 dalecurtis@chromium.org
 dcastagna@chromium.org
+hiroh@chromium.org
 jcliang@chromium.org
 kcwu@chromium.org
 posciak@chromium.org