Updating owners of libprocessgroup

Adding tjmercier@google.com and carlosgalo@google.com, and removing
ccross@google.com, in the OWNERS file. Adding buganizer component to
OWNERS.

Bug: 262738363
Test: N/A
Change-Id: I7f8cdc513232b46eb341f3c98f64dfb1d9bd9d7a
diff --git a/libprocessgroup/OWNERS b/libprocessgroup/OWNERS
index 8ebb8cc..d5aa721 100644
--- a/libprocessgroup/OWNERS
+++ b/libprocessgroup/OWNERS
@@ -1,2 +1,4 @@
-ccross@google.com
+# Bug component: 1293033
 surenb@google.com
+tjmercier@google.com
+carlosgalo@google.com