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
R=bsalomon@google.com

Author: kkinnunen@nvidia.com

Review URL: https://codereview.chromium.org/212753002

git-svn-id: http://skia.googlecode.com/svn/trunk@14334 2bbb7eff-a529-9590-31e7-b0007b416f81
24 files changed