Adding OWNERS in /third_party/vulkan

Making sure there are at least 2 owners after I leave.
This CL was uploaded by git cl split.

R=penghuang@chromium.org

Change-Id: I16d9dc381699c884d6c335a16664b389fc82dc58
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1674612
Auto-Submit: Antoine Labour <piman@chromium.org>
Commit-Queue: Peng Huang <penghuang@chromium.org>
Reviewed-by: Peng Huang <penghuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#672065}
diff --git a/third_party/vulkan/OWNERS b/third_party/vulkan/OWNERS
index 211e038..f119de20 100644
--- a/third_party/vulkan/OWNERS
+++ b/third_party/vulkan/OWNERS
@@ -1,3 +1,4 @@
+penghuang@chromium.org
 piman@chromium.org
 vmiura@chromium.org