Add emircan@ to Mac and Win encoder OWNERS

Proposing to add myself as the owner since I have been maintaining and reviewing
these files and looking forward to cleanups and adding more profiles support
soon.

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: I73e637c376e91df209f759fb55d5f6ba8d86a219
Reviewed-on: https://chromium-review.googlesource.com/1130230Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Emircan Uysaler <emircan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#573527}

media/gpu/OWNERS

@@ -9,3 +9,6 @@ wuchengli@chromium.org
 # For Android media gpu files.
 per-file *android*=liberato@chromium.org
 per-file *avda*=liberato@chromium.org
+
+# For Mac encoder files.
+per-file *vt_video_encode*=emircan@chromium.org

media/gpu/windows/OWNERS

+# For encoder files.
+per-file *encode*=emircan@chromium.org