Change GrGLProgramDesc header to have DoPathRendering flag instead of RequiresVertexShader

src/gpu/gl/builders/GrGLFragmentOnlyProgramBuilder.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrGLFragmentOnlyProgramBuilder.h"
 #include "../GrGpuGL.h"
 
 GrGLFragmentOnlyProgramBuilder::GrGLFragmentOnlyProgramBuilder(GrGpuGL* gpu,
                                                                const GrGLProgramDesc& desc)
     : INHERITED(gpu, desc) {
-    SkASSERT(!desc.getHeader().fRequiresVertexShader);
+    SkASSERT(desc.getHeader().fDoPathRendering);
     SkASSERT(gpu->glCaps().pathRenderingSupport());
     SkASSERT(GrGLProgramDesc::kAttribute_ColorInput != desc.getHeader().fColorInput);
     SkASSERT(GrGLProgramDesc::kAttribute_ColorInput != desc.getHeader().fCoverageInput);
 }
 
 int GrGLFragmentOnlyProgramBuilder::addTexCoordSets(int count) {
     int firstFreeCoordSet = fTexCoordSetCnt;
     fTexCoordSetCnt += count;
     SkASSERT(gpu()->glCaps().maxFixedFunctionTextureCoords() >= fTexCoordSetCnt);
     return firstFreeCoordSet;
 }
 
 GrGLProgramEffects* GrGLFragmentOnlyProgramBuilder::createAndEmitEffects(
         const GrEffectStage* effectStages[], int effectCnt,
         const GrGLProgramDesc::EffectKeyProvider& keyProvider, GrGLSLExpr4* inOutFSColor) {
 
     GrGLPathTexGenProgramEffectsBuilder pathTexGenEffectsBuilder(this,
                                                                  effectCnt);
     this->INHERITED::createAndEmitEffects(&pathTexGenEffectsBuilder,
                                           effectStages,
                                           effectCnt,
                                           keyProvider,
                                           inOutFSColor);
     return pathTexGenEffectsBuilder.finish();
 }