First step to moving vertex attributes to the geometryProcessor

src/gpu/gl/GrGLGeometryProcessor.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrGLGeometryProcessor_DEFINED
 #define GrGLGeometryProcessor_DEFINED
 
 #include "GrGLProcessor.h"
 
 class GrGLGPBuilder;
 
 /**
  * If a GL effect needs a GrGLFullShaderBuilder* object to emit vertex code, then it must inherit
  * from this class. Since paths don't have vertices, this class is only meant to be used internally
  * by skia, for special cases.
  */
 class GrGLGeometryProcessor : public GrGLProcessor {
 public:
     GrGLGeometryProcessor(const GrBackendProcessorFactory& factory)
         : INHERITED(factory) {}
 
     struct EmitArgs {
         EmitArgs(GrGLGPBuilder* pb,
                  const GrGeometryProcessor& gp,
-                 const char* output,
-                 const char* input,
+                 const char* outputColor,
+                 const char* outputCoverage,
                  const TextureSamplerArray& samplers)
-            : fPB(pb), fGP(gp), fOutput(output), fInput(input), fSamplers(samplers) {}
+            : fPB(pb)
+            , fGP(gp)
+            , fOutputColor(outputColor)
+            , fOutputCoverage(outputCoverage)
+            , fSamplers(samplers) {}
         GrGLGPBuilder* fPB;
         const GrGeometryProcessor& fGP;
-        const char* fOutput;
-        const char* fInput;
+        const char* fOutputColor;
+        const char* fOutputCoverage;
         const TextureSamplerArray& fSamplers;
     };
     /**
      * This is similar to emitCode() in the base class, except it takes a full shader builder.
      * This allows the effect subclass to emit vertex code.
      */
     virtual void emitCode(const EmitArgs&) = 0;
 
 private:
     typedef GrGLProcessor INHERITED;
 };
 
 #endif