Extend the duration of the tough_filters_cases page set.
Extend the duration of the tough_filters_cases page set.

Nexus10 is currently timing out before rendering the first frame of
filter_terrain.svg. By extending the test from 5 to 10 seconds, we
should give it more of a chance to render. This should also reduce
noise on the other platforms.

R=dtu@chromium.org
BUG=402884

Review URL: https://codereview.chromium.org/462143002

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@289495 0039d316-1c4b-4281-b951-d872f2087c98

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