add a GM case to ensure path effect for big filled/stroked text is correctly rendered

add a GM case to ensure path effect for big filled/stroked text and hairline text is correctly rendered.

BUG=skia:2555
@reed has landed a patch to add path effect to gm case stroketext. So close this one.

[yunchao, 2014-05-20 15:37:49]

On 2014/05/15 09:10:02, Richard Ho wrote:

ping...

[reed1, 2014-05-20 17:27:41]

Is this different from "stroketext" gm, that shows a bug when stroking big text
using drawPosText?

[yunchao, 2014-05-21 13:10:13]

On 2014/05/20 17:27:41, reed1 wrote:
> Is this different from "stroketext" gm, that shows a bug when stroking big
text
> using drawPosText?

Yes, they are different. This gm add path effect to big text(thick-stroked,
hairline stroked, filled), and show another rendering errors exists in
drawPosText_asPaths. But it is correct in drawText_asPaths. You can see the
rendering result at skbug.com/2555.

[yunchao, 2014-05-21 13:26:27]

On 2014/05/21 13:10:13, Richard Ho wrote:
> On 2014/05/20 17:27:41, reed1 wrote:
> > Is this different from "stroketext" gm, that shows a bug when stroking big
> text
> > using drawPosText?
> 
> Yes, they are different. This gm add path effect to big text(thick-stroked,
> hairline stroked, filled), and show another rendering errors exists in
> drawPosText_asPaths. But it is correct in drawText_asPaths. You can see the
> rendering result at skbug.com/2555.

The rendering error showed by this new added GM case and the rendering error in
stroketext are both fixed at https://codereview.chromium.org/284763010/, PTAL.