Add kevinjeon@ to PERFORMANCE_OWNERS

Change-Id: I07b55a8579ef06bd9bd768af9292f047596e223a
diff --git a/PERFORMANCE_OWNERS b/PERFORMANCE_OWNERS
index 48a0201..02b0a1e 100644
--- a/PERFORMANCE_OWNERS
+++ b/PERFORMANCE_OWNERS
@@ -6,3 +6,4 @@
 shayba@google.com
 jdduke@google.com
 shombert@google.com
+kevinjeon@google.com