Mark some tests flaky.

Mark some tests flaky.

- css3/images/cross-fade-invalidation.html [ ImageOnlyFailure Pass ]
- fast/media/lifetime.html [ Crash Pass Timeout ]
- gamepad/gamepad-polling-access.html [ Crash Pass ]
- http/tests/misc/object-embedding-svg-delayed-size-negotiation-2.htm [ Pass Timeout ]
- http/tests/security/contentSecurityPolicy/report-cross-origin-no-cookies.html [ Failure Pass ]
- http/tests/security/contentSecurityPolicy/report-cross-origin-no-cookies.html [ Pass Timeout ]
- inspector/audits/audits-panel-functional.html [ Failure Pass ]
- media/activation-behavior.html [ Pass Failure Timeout ]
- media/autoplay.html [ Failure Pass ]
- virtual/threaded/animations/animation-hit-test.html [ Failure Pass ]
- virtual/threaded/animations/keyframe-timing-functions2.html [ Pass Timeout ]
- virtual/threaded/animations/unanimated-style.html [ Pass Timeout ]
- web-animations-api/timeline-updates-players.html [ Failure Pass ]
- web-animations-api/timeline-updates-players.html [ Failure Pass ]

BUG=355489, 357068, 357069, 357071, 357074, 357075, 357079, 357080, 357082, 357084, 357085, 357088
TBR=enne@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=170151

[tkent, 2014-03-27 09:20:14]

Committed patchset #1 manually as r170151 (presubmit successful).