Mark http/tests/serviceworker/resource-timing.html as flaky
Mark http/tests/serviceworker/resource-timing.html as flaky

BUG=498167
TBR=enne,ksakamoto
NOTRY=true

Review URL: https://codereview.chromium.org/1170103003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@196752 bbb929c8-8fbe-4397-9dbb-9b2b20218538

Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk,Pluto-tv/blink-crosswalk