Add gl_SampleMask functionality to fragment builders

src/gpu/glsl/GrGLSL.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrGLSL_DEFINED
 #define GrGLSL_DEFINED
 
@@ skipping 19 matching lines @@
     k140_GrGLSLGeneration,
     /**
      * Desktop GLSL 1.50
      */
     k150_GrGLSLGeneration,
     /**
      * Desktop GLSL 3.30, and ES GLSL 3.00
      */
     k330_GrGLSLGeneration,
     /**
+     * Desktop GLSL 4.00
+     */
+    k400_GrGLSLGeneration,
+    /**
      * ES GLSL 3.10 only TODO Make GLSLCap objects to make this more granular
      */
     k310es_GrGLSLGeneration,
+    /**
+     * ES GLSL 3.20
+     */
+    k320es_GrGLSLGeneration,
 };
 
 bool GrGLSLSupportsNamedFragmentShaderOutputs(GrGLSLGeneration);
 
 /**
  * Gets the name of the function that should be used to sample a 2D texture. Coord type is used
  * to indicate whether the texture is sampled using projective textured (kVec3f) or not (kVec2f).
  */
 inline const char* GrGLSLTexture2DFunctionName(GrSLType coordType, GrSLType samplerType,
                                                GrGLSLGeneration glslGen) {
@@ skipping 294 matching lines @@
 
 /**
  * Does an inplace mul, *=, of vec4VarName by mulFactor.
  * A semicolon is added after the assignment.
  */
 void GrGLSLMulVarBy4f(SkString* outAppend, const char* vec4VarName, const GrGLSLExpr4& mulFactor);
 
 #include "GrGLSL_impl.h"
 
 #endif