Add 002-sleep as timing sensitive.

The buildbots have chewed on it a few times.

Change-Id: Icf81cf4baa8e06573ed92bf61c0861c64825475a
diff --git a/test/Android.run-test.mk b/test/Android.run-test.mk
index 81cfb70..8c5ff0a 100644
--- a/test/Android.run-test.mk
+++ b/test/Android.run-test.mk
@@ -222,6 +222,7 @@
 
 # Tests that are timing sensitive and flaky on heavily loaded systems.
 TEST_ART_TIMING_SENSITIVE_RUN_TESTS := \
+  002-sleep \
   053-wait-some \
   055-enum-performance \
   133-static-invoke-super