Bug fix for es 3.00 fb fetch

src/gpu/gl/builders/GrGLFragmentShaderBuilder.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 GrGLFragmentShaderBuilder_DEFINED
 #define GrGLFragmentShaderBuilder_DEFINED
 
@@ skipping 131 matching lines @@
         kTopLeftFragPosRead_FragPosKey      = 0x1,// Read frag pos relative to top-left.
         kBottomLeftFragPosRead_FragPosKey   = 0x2,// Read frag pos relative to bottom-left.
     };
 
     static const char* kDstCopyColorName;
 
     bool fHasCustomColorOutput;
     bool fHasSecondaryOutput;
     bool fSetupFragPosition;
     bool fTopLeftFragPosRead;
+    int  fCustomColorOutputIndex;
 
     // some state to verify shaders and effects are consistent, this is reset between effects by
     // the program creator
     bool fHasReadDstColor;
     bool fHasReadFragmentPosition;
 
     friend class GrGLNvprProgramBuilder;
     friend class GrGLProgramBuilder;
 
     typedef GrGLFPFragmentBuilder INHERITED;
 };
 
 #endif