CanvasRenderingContext2D setFillColor tries to unwrap a number

[DartBot]

This issue was originally filed by domi...@google.com

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 void render(html.CanvasRenderingContext2D context) {
       num r = 255;
       num g = 0;
       num b = 0;
       context.setFillColor(r, g, b);
       context.fillRect(100, 100, 64, 64);
   }

The call CanvasRenderingContext2DWrappingImplementation.setFillColor correctly determines that r is a number and that g and b are non-null. It then calls

this._ptr.setFillColor$4(LevelDom.unwrap(c_OR_color_OR_grayLevel_OR_r), alpha_OR_g_OR_m, b_OR_y, a_OR_k);

which tries to unwrap r as a number, which fails with the exception:

Uncaught TypeError: Object 255 has no method 'get$_ptr'
    LevelDom.unwrap
    CanvasRenderingContext2DWrappingImplementation.setFillColor

[DartBot]

This comment was originally written by jrgf...@google.com

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Added Duplicate label.
Marked as being merged into #150.