added support for PLS path rendering

src/gpu/glsl/GrGLSLFragmentShaderBuilder.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 GrGLSLFragmentShaderBuilder_DEFINED
 #define GrGLSLFragmentShaderBuilder_DEFINED
 
@@ skipping 15 matching lines @@
         , fHasSecondaryOutput(false) {
         fSubstageIndices.push_back(0);
     }
     virtual ~GrGLSLFragmentBuilder() {}
     /**
      * Use of these features may require a GLSL extension to be enabled. Shaders may not compile
      * if code is added that uses one of these features without calling enableFeature()
      */
     enum GLSLFeature {
         kStandardDerivatives_GLSLFeature = 0,
-        kLastGLSLFeature = kStandardDerivatives_GLSLFeature
+        kPixelLocalStorage_GLSLFeature = 1,
+        kLastGLSLFeature = kPixelLocalStorage_GLSLFeature
     };
 
     /**
      * If the feature is supported then true is returned and any necessary #extension declarations
      * are added to the shaders. If the feature is not supported then false will be returned.
      */
     virtual bool enableFeature(GLSLFeature) = 0;
 
     /**
      * This returns a variable name to access the 2D, perspective correct version of the coords in
@@ skipping 12 matching lines @@
      * on a child proc.
      */
     void onBeforeChildProcEmitCode();
     void onAfterChildProcEmitCode();
 
     const SkString& getMangleString() const { return fMangleString; }
 
     bool hasCustomColorOutput() const { return fHasCustomColorOutput; }
     bool hasSecondaryOutput() const { return fHasSecondaryOutput; }
 
+    void declAppendf(const char* fmt, ...);
+
 protected:
     bool fHasCustomColorOutput;
     bool fHasSecondaryOutput;
 
 private:
     /*
      * State that tracks which child proc in the proc tree is currently emitting code.  This is
      * used to update the fMangleString, which is used to mangle the names of uniforms and functions
      * emitted by the proc.  fSubstageIndices is a stack: its count indicates how many levels deep
      * we are in the tree, and its second-to-last value is the index of the child proc at that
@@ skipping 115 matching lines @@
     bool fHasReadDstColor;
     bool fHasReadFragmentPosition;
 
     friend class GrGLSLProgramBuilder;
     friend class GrGLProgramBuilder;
 
     typedef GrGLSLXPFragmentBuilder INHERITED;
 };
 
 #endif