Add OWNERS for ObjC dirs.

BUG=

Review URL: https://codereview.webrtc.org/1379923002

Cr-Commit-Position: refs/heads/master@{#10123}
diff --git a/talk/app/webrtc/objc/OWNERS b/talk/app/webrtc/objc/OWNERS
new file mode 100644
index 0000000..cd06158
--- /dev/null
+++ b/talk/app/webrtc/objc/OWNERS
@@ -0,0 +1 @@
+tkchin@webrtc.org
diff --git a/talk/app/webrtc/objctests/OWNERS b/talk/app/webrtc/objctests/OWNERS
new file mode 100644
index 0000000..cd06158
--- /dev/null
+++ b/talk/app/webrtc/objctests/OWNERS
@@ -0,0 +1 @@
+tkchin@webrtc.org