[Telemetry] Disable blink_perf.web_animations.
[Telemetry] Disable blink_perf.web_animations.

This required implementing the test.enabled functionality.

BUG=312521
R=dtu@chromium.org
TBR=dtu@chromium.org

Review URL: https://codereview.chromium.org/48793006

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@231599 0039d316-1c4b-4281-b951-d872f2087c98

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