Draft change to start pulling uniform color into GP

include/gpu/effects/GrPorterDuffXferProcessor.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrPorterDuffXferProcessor_DEFINED
 #define GrPorterDuffXferProcessor_DEFINED
 
@@ skipping 19 matching lines @@
 
     GrGLXferProcessor* createGLInstance() const SK_OVERRIDE;
 
     virtual bool hasSecondaryOutput() const SK_OVERRIDE;
 
     ///////////////////////////////////////////////////////////////////////////
     /// @name Stage Output Types
     ////
 
     enum PrimaryOutputType {
+        kNone_PrimaryOutputType,
+        kColor_PrimaryOutputType,
+        kCoverage_PrimaryOutputType,
         // Modulate color and coverage, write result as the color output.
         kModulate_PrimaryOutputType,
         // Combines the coverage, dst, and color as coverage * color + (1 - coverage) * dst. This
         // can only be set if fDstReadKey is non-zero.
         kCombineWithDst_PrimaryOutputType,
     };
 
     enum SecondaryOutputType {
         // There is no secondary output
         kNone_SecondaryOutputType,
@@ skipping 107 matching lines @@
 
     GR_DECLARE_XP_FACTORY_TEST;
 
     GrBlendCoeff fSrcCoeff;
     GrBlendCoeff fDstCoeff;
 
     typedef GrXPFactory INHERITED;
 };
 
 #endif