Opt state takes a GP instead of a GeometryStage

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) {}
 
     /**
      * 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(GrGLGPBuilder* builder,
                           const GrGeometryProcessor& geometryProcessor,
                           const GrProcessorKey& key,
                           const char* outputColor,
                           const char* inputColor,
                           const TransformedCoordsArray& coords,
                           const TextureSamplerArray& samplers) = 0;
 
 private:
     typedef GrGLProcessor INHERITED;
 };
 
 #endif