Remove translate param from GrContext::drawPath

Remove translate param from GrContext::drawPath (and subsequent calls).
Committed: https://code.google.com/p/skia/source/detail?r=5852

[bsalomon, 2012-10-08 14:24:22]

The translate param on GrContext::drawPath was giving me grief  while working on
how we handle matrix changes wrt custom stages. It turns out we rarely use it
and aren't consistent in how the translation is applied (pre or post vm).
Because it is so rarely used and usually used when the vm is identity or
translate-only, these inconsistencies have remained for some time undetected.

This change removes the parameter. The caller has to adjust the GrContext matrix
before calling drawPath.

[robertphillips, 2012-10-08 14:33:18]

LGTM + 1 question

https://codereview.appspot.com/6615062/diff/5/src/gpu/SkGpuDevice.cpp
File src/gpu/SkGpuDevice.cpp (right):

https://codereview.appspot.com/6615062/diff/5/src/gpu/SkGpuDevice.cpp#newcode880
src/gpu/SkGpuDevice.cpp:880: 
Is this really supposed to be preserve?

[bsalomon, 2012-10-08 14:44:37]

https://codereview.appspot.com/6615062/diff/5/src/gpu/SkGpuDevice.cpp
File src/gpu/SkGpuDevice.cpp (right):

https://codereview.appspot.com/6615062/diff/5/src/gpu/SkGpuDevice.cpp#newcode880
src/gpu/SkGpuDevice.cpp:880: 
On 2012/10/08 14:33:18, robertphillips wrote:
> Is this really supposed to be preserve?

Yeah, The code below now first replaces the current matrix with a translation
matrix and then with an identity matrix.  It seemed better to me to do nothing
to the matrix here then to move the translation setup here, away from the draw.

I'll add a comment to make it more clear.