TimeoutException in gallery accessibility_test

[tvolkert]

01:09 +84 ~15: /private/tmp/flutter sdk/examples/flutter_gallery/test/accessibility_test.dart: All material demos meet text contrast guidelines reorderable_list_demo ThemeData.light()                
══╡ EXCEPTION CAUGHT BY FLUTTER TEST FRAMEWORK ╞════════════════════════════════════════════════════
The following TimeoutException was thrown running a test:
TimeoutException after 0:00:03.500000: The test exceeded the timeout. It may have hung.
Consider using "addTime" to increase the timeout before expensive operations.
When the exception was thrown, this was the stack:
#2      AutomatedTestWidgetsFlutterBinding._checkTimeout (package:flutter_test/src/binding.dart:824:25)
#16     _Timer._runTimers (dart:isolate/runtime/libtimer_impl.dart:382:19)
#17     _Timer._handleMessage (dart:isolate/runtime/libtimer_impl.dart:416:5)
#18     _RawReceivePortImpl._handleMessage (dart:isolate/runtime/libisolate_patch.dart:171:12)
#22     AutomatedTestWidgetsFlutterBinding.runTest (package:flutter_test/src/binding.dart:874:27)
#23     testWidgets.<anonymous closure> (package:flutter_test/src/widget_tester.dart:71:22)
#24     Declarer.test.<anonymous closure>.<anonymous closure>.<anonymous closure> (package:test/src/backend/declarer.dart:168:27)
#27     Declarer.test.<anonymous closure>.<anonymous closure>.<anonymous closure> (package:test/src/backend/declarer.dart:0:0)
#28     Invoker.waitForOutstandingCallbacks.<anonymous closure> (package:test/src/backend/invoker.dart:250:15)
#34     Invoker._onRun.<anonymous closure>.<anonymous closure>.<anonymous closure> (package:test/src/backend/invoker.dart:403:15)
(elided 24 frames from package dart:async and package stack_trace)
The test description was:
reorderable_list_demo ThemeData.light()
════════════════════════════════════════════════════════════════════════════════════════════════════
01:09 +84 ~15 -1: /private/tmp/flutter sdk/examples/flutter_gallery/test/accessibility_test.dart: All material demos meet text contrast guidelines reorderable_list_demo ThemeData.light() [E]         
  Test failed. See exception logs above.
  The test description was: reorderable_list_demo ThemeData.light()

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