Establish owners for the AnrTimer feature

Assign ownership to the AnrTimer files in the java source, java unit
test, and jni directories.

Bug: 282428924

Test: none - OWNERS only

Change-Id: I208296bc0cf8369d59ef51c620f50939f843173d
diff --git a/OWNERS b/OWNERS
index 023bdef..733157f 100644
--- a/OWNERS
+++ b/OWNERS
@@ -37,3 +37,5 @@
 
 per-file *ravenwood* = file:ravenwood/OWNERS
 per-file *Ravenwood* = file:ravenwood/OWNERS
+
+per-file PERFORMANCE_OWNERS = file:/PERFORMANCE_OWNERS