A _setFont() error breaks a few gfx canvas test cases

[liyang]

A number of gfx test cases breaks with the canvas render, throwing a _setFont() error.

	test_fx.html 
	test_linestyle.html 
	test_text.html 
	test_textpath.html 

[liyang]

From source code, dojox.gfx.Text is empty at the moment, so all text features of canvas does not work.

[liyang]

Text is implemented on my local trunk, however the linestyle and textpath still break.

[liyang]

Some hints: stroke with an image maybe an option for linestyle; vector text maybe an option for textpath.

[Eugene Lazutkin]

Missed: [23733].