Update OWNERS for ContextTest.java

Bug: 161145287
Test: Build
Change-Id: If0779932fe3efdd5bc07d3e7179a95aa653e5342
diff --git a/tests/tests/content/OWNERS b/tests/tests/content/OWNERS
index eb33966..044786d 100644
--- a/tests/tests/content/OWNERS
+++ b/tests/tests/content/OWNERS
@@ -2,4 +2,5 @@
 patb@google.com
 schfan@google.com
 alexbuy@google.com
-rtmitchell@google.com
+zyy@google.com
+per-file ContextTest.java = jacobhobbie@google.com,mpgroover@google.com