Clock sample runs at half frame rate in dartium

[ricowind]

The clock sample runs at roughly half frame rate in Dartium (on windows) 30 fps, compared to running the dart2js compiled output, 60 fps, on both chrome and IE 9!

[a-siva]

Is this a windows only problem? I tried this on my linux build and I see the clock demo running at about 62fps.

[ricowind]

Hey Siva,

I don't see the issue on my Linux box either, but that is a z620.

I do see it on my Windows box (old T3400). I get more or less constantly 60 fps on dart2js compiled output in chrome and between 25 and 40 on dartium. CPU load is not going through the roof, but is pretty stable around 5-10% usage in dartium.

[jacob314]

I believe the issue is request animation frame only triggering at 30fps likely due to an upstream blink bug.

---

Added Duplicate label.
Marked as being merged into #12442.