Mark test-cpu-profiler/JsNativeJsRuntimeJsSample as flaky

BUG=v8:3308
LOG=n
TBR=yurys@chromium.org

Review URL: https://codereview.chromium.org/268093002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@21143 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

test/cctest/cctest.status

@@ -76,6 +76,8 @@
   'test-cpu-profiler/CollectCpuProfile': [PASS, FLAKY],
   # BUG(3287).
   'test-cpu-profiler/SampleWhenFrameIsNotSetup': [PASS, FLAKY],
+  # BUG(3308).
+  'test-cpu-profiler/JsNativeJsRuntimeJsSample': [PASS, FLAKY]
 
   ############################################################################
   # Slow tests.