[Sheriff] Mark cpu profiler test as flaky on arm.

BUG=v8:2999
TBR=jkummerow@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/138183006

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@18605 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

test/cctest/cctest.status

@@ -101,6 +101,9 @@
   'test-serialize/DeserializeAndRunScript2': [SKIP],
   'test-serialize/DeserializeFromSecondSerialization': [SKIP],
 
+  # BUG(2999).
+  'test-cpu-profiler/CollectCpuProfile': [PASS, FLAKY],
+
   ############################################################################
   # Slow tests.
   'test-api/Threading1': [PASS, SLOW],