[Telemetry] Raise timeout on maps smoothness test.

It's timing out on some android bots and from a local run, it seems
to just be legitimately slower than the default 60s timeout.

BUG=405381

Review URL: https://codereview.chromium.org/510413002

Cr-Commit-Position: refs/heads/master@{#292437}

tools/perf/page_sets/maps.py

@@ -28,7 +28,7 @@ class MapsPage(page_module.Page):
     action_runner.Wait(3)
 
   def RunSmoothness(self, action_runner):
-    action_runner.WaitForJavaScriptCondition('window.testDone')
+    action_runner.WaitForJavaScriptCondition('window.testDone', 120)
 
 
 class MapsPageSet(page_set_module.PageSet):