Revert of Turned on SkSL->GLSL compiler

src/sksl/ast/SkSLASTLayout.h

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
  
 #ifndef SKSL_ASTLAYOUT
 #define SKSL_ASTLAYOUT
 
 #include "SkSLASTNode.h"
 #include "SkSLUtil.h"
 
 namespace SkSL {
 
 /**
  * Represents a layout block appearing before a variable declaration, as in:
  *
  * layout (location = 0) int x;
  */
 struct ASTLayout : public ASTNode {
     // For all parameters, a -1 means no value
-    ASTLayout(int location, int binding, int index, int set, int builtin, bool originUpperLeft,
-              bool overrideCoverage, bool blendSupportAllEquations)
+    ASTLayout(int location, int binding, int index, int set, int builtin, bool originUpperLeft)
     : fLocation(location)
     , fBinding(binding)
     , fIndex(index)
     , fSet(set)
     , fBuiltin(builtin)
-    , fOriginUpperLeft(originUpperLeft)
-    , fOverrideCoverage(overrideCoverage)
-    , fBlendSupportAllEquations(blendSupportAllEquations) {}
+    , fOriginUpperLeft(originUpperLeft) {}
 
     std::string description() const {
         std::string result;
         std::string separator;
         if (fLocation >= 0) {
             result += separator + "location = " + to_string(fLocation);
             separator = ", ";
         }
         if (fBinding >= 0) {
             result += separator + "binding = " + to_string(fBinding);
             separator = ", ";
         }
         if (fIndex >= 0) {
             result += separator + "index = " + to_string(fIndex);
             separator = ", ";
         }
         if (fSet >= 0) {
             result += separator + "set = " + to_string(fSet);
             separator = ", ";
         }
         if (fBuiltin >= 0) {
             result += separator + "builtin = " + to_string(fBuiltin);
             separator = ", ";
         }
         if (fOriginUpperLeft) {
             result += separator + "origin_upper_left";
             separator = ", ";
         }
-        if (fOverrideCoverage) {
-            result += separator + "override_coverage";
-            separator = ", ";
-        }
-        if (fBlendSupportAllEquations) {
-            result += separator + "blend_support_all_equations";
-            separator = ", ";
-        }
         if (result.length() > 0) {
             result = "layout (" + result + ")";
         }
         return result;
     }
 
     const int fLocation;
     const int fBinding;
     const int fIndex;
     const int fSet;
     const int fBuiltin;
     const bool fOriginUpperLeft;
-    const bool fOverrideCoverage;
-    const bool fBlendSupportAllEquations;
 };
 
 } // namespace
 
 #endif