Add factory class for generating various flavors of GrTextContext.

src/gpu/GrTextContext.cpp

 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "GrTextContext.h"
 
-GrTextContext::GrTextContext(GrContext* context, const GrPaint& paint) : fPaint(paint) {
+GrTextContext::GrTextContext(GrContext* context, const GrPaint& paint,
+                             const SkPaint& skPaint) : fPaint(paint), fSkPaint(skPaint) {
     fContext = context;
 
     const GrClipData* clipData = context->getClip();
 
     SkRect devConservativeBound;
     clipData->fClipStack->getConservativeBounds(
                                      -clipData->fOrigin.fX,
                                      -clipData->fOrigin.fY,
                                      context->getRenderTarget()->width(),
                                      context->getRenderTarget()->height(),
                                      &devConservativeBound);
 
     devConservativeBound.roundOut(&fClipRect);
 
     fDrawTarget = fContext->getTextTarget();
 }