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

Cr-Commit-Position: refs/heads/master@{#289495}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@289495 0039d316-1c4b-4281-b951-d872f2087c98

tools/perf/page_sets/tough_filters_cases.py

@@ -8,7 +8,7 @@ from telemetry.page import page_set as page_set_module
 class ToughFiltersCasesPage(page_module.Page):
 
   def RunSmoothness(self, action_runner):
-    action_runner.Wait(5)
+    action_runner.Wait(10)
 
 
 class ToughFiltersCasesPageSet(page_set_module.PageSet):