Revert of Remove GrStagedProcessor, remove the word Stage as it applies to FPs

src/gpu/gl/GrGLPathProgram.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrGLPathProgram_DEFINED
 #define GrGLPathProgram_DEFINED
 
@@ skipping 16 matching lines @@
                     const UniformInfoArray&,
                     const SeparableVaryingInfoArray&,
                     GrGLInstalledGeoProc*,
                     GrGLInstalledXferProc* xferProcessor,
                     GrGLInstalledFragProcs* fragmentProcessors,
                     SkTArray<UniformHandle>* passSamplerUniforms);
 
 private:
     void didSetData() override;
     virtual void setTransformData(const GrPrimitiveProcessor&,
-                                  const GrFragmentProcessor&,
+                                  const GrPendingFragmentStage&,
                                   int index,
                                   GrGLInstalledFragProc*) override;
     void onSetRenderTargetState(const GrPrimitiveProcessor&, const GrPipeline&) override;
 
     friend class GrGLPathProgramBuilder;
 
     GrGLPathProgramDataManager fPathProgramDataManager;
 
     typedef GrGLProgram INHERITED;
 };
 
 #endif