Use fixed function pipeline only when drawing paths

Use fixed function pipeline only when drawing paths

Use fixed function pipeline only when drawing paths. Previously FF
vertex shader was used when drawing normal geometry if path rendering
was enabled.

This is required to make Chromium integration easier. This way
fixed function vertex shading, including vertexshader-less programs,
need not be implemented in the Chromium command buffer.

Removes FF TexGen functionality, as it is not used anymore. Likewise
removes the fixedFunctionSupport GL capability flag.

BUG=chromium:344330
Committed: http://code.google.com/p/skia/source/detail?r=14334

[Kimmo Kinnunen, 2014-03-26 12:05:02]

As per the Chromium cmd buffer design doc

If this is ok, or even if not, could you click some try bots? Like mac, windows,
android? I can not still run try compiles, and I have not verified this change
on all the platforms that I modify..

[bsalomon, 2014-03-26 13:52:54]

It lgtm. I submitted a bunch of try bots.

[bsalomon, 2014-04-23 15:09:04]

The CQ bit was checked by bsalomon@google.com

[commit-bot: I haz the power, 2014-04-23 15:09:12]

CQ is trying da patch. Follow status at
https://skia-tree-status.appspot.com/cq/kkinnunen@nvidia.com/212753002/210001

[commit-bot: I haz the power, 2014-04-23 19:26:35]

Change committed as 14334