window.history.pushState broken

[DartBot]

This issue was originally filed by jorat1...@gmail.com

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What steps will reproduce the problem?

1. Run the sample Swarm

What is the expected output? What do you see instead?
Working.

What version of the product are you using? On what operating system?
Dart build 11394

Please provide any additional information below.
The debugger break with the stack :
Exception: String expected
Stack Trace: #­0 _HistoryImpl.pushState (e:\b\build\slave\dartium-win-full\build\src\build\Release\obj\global_intermediate\webkit\bindings\dart\dart\HistoryImplementation.dart:8:3)

­1 UIState.pushToHistory (http://127.0.0.1:3030/C:/Dart/samples/swarm/UIState.dart:61:29)

­2 ArticleView.afterRender.<anonymous closure> (http://127.0.0.1:3030/C:/Dart/samples/swarm/SwarmViews.dart:757:34)

Thanks.

[madsager]

Added Area-HTML, Triaged labels.

[vsmenon]

Added this to the M2 milestone.

[blois]

Removed this from the M2 milestone.
Added this to the M3 milestone.

[blois]

history.pushState tests have recently been stabilized and are now passing on all supported platforms (note that it is not supported on IE9).

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Added AssumedStale label.