Update OWNERS for tracing, including the Java APIs.

Change-Id: I7b4f972f09695c68110ed09e3a75e35e40a61387
diff --git a/TRACE_OWNERS b/TRACE_OWNERS
new file mode 100644
index 0000000..f746a16
--- /dev/null
+++ b/TRACE_OWNERS
@@ -0,0 +1,5 @@
+# OWNERS of Trace-related files
+primiano@google.com
+timmurray@google.com
+jjaggi@google.com
+jreck@google.com