Pass GrCustomStage to key-generation functions and emitCode().

Pass GrCustomStage to key-generation functions and emitCode().

R=robertphillips@google.com
Committed: https://code.google.com/p/skia/source/detail?r=6182

[bsalomon, 2012-10-29 16:47:34]

My earlier change passed GrEffectStage to setData() but GenKey() and emitCode()
are still taking GrStage. To handle matrices in the effects we need to know
about the coord change matrix, which is owned by GrEffectStage, in GenKey().

[robertphillips, 2012-10-29 17:00:31]

LGTM

[bsalomon, 2012-10-29 19:20:46]

Pass GrCustomStage to key-generation functions and emitCode().

R=robertphillips@google.com

[bsalomon, 2012-10-29 19:33:30]

It wasn't possible to remove the dependence of GrEffectStage on
GrBackendEffectFactory because it uses GrBackendEffectFactory::operator==(). We
could move that to a cpp, but it seems like a function that would benefit from
inlining. So this adds GrTBackendEffectFactory.h which includes GrEffectStage.h

BTW your last review was at patchset 2.

[robertphillips, 2012-10-29 19:37:30]

LGTM + 2 typo nits

https://codereview.appspot.com/6819046/diff/3005/include/gpu/GrBackendEffectF...
File include/gpu/GrBackendEffectFactory.h (right):

https://codereview.appspot.com/6819046/diff/3005/include/gpu/GrBackendEffectF...
include/gpu/GrBackendEffectFactory.h:18: is assigned a generation ID at
construction. The ID of the return of GrEffect::getFactory()
identifier

https://codereview.appspot.com/6819046/diff/3005/include/gpu/GrBackendEffectF...
include/gpu/GrBackendEffectFactory.h:20: getFactory(). GrEffect subclasses
should use the derived class GrTBackendEffectFactory that is
requires