Turned on SkSL->GLSL compiler

src/sksl/ir/SkSLIndexExpression.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_INDEX
 #define SKSL_INDEX
 
 #include "SkSLExpression.h"
 #include "SkSLUtil.h"
 
 namespace SkSL {
 
 /**
  * Given a type, returns the type that will result from extracting an array value from it.
  */
 static const Type& index_type(const Context& context, const Type& type) {
     if (type.kind() == Type::kMatrix_Kind) {
         if (type.componentType() == *context.fFloat_Type) {
-            switch (type.columns()) {
+            switch (type.rows()) {
                 case 2: return *context.fVec2_Type;
                 case 3: return *context.fVec3_Type;
                 case 4: return *context.fVec4_Type;
                 default: ASSERT(false);
             }
         } else {
             ASSERT(type.componentType() == *context.fDouble_Type);
-            switch (type.columns()) {
+            switch (type.rows()) {
                 case 2: return *context.fDVec2_Type;
                 case 3: return *context.fDVec3_Type;
                 case 4: return *context.fDVec4_Type;
                 default: ASSERT(false);
             }
         }
     }
     return type.componentType();
 }
 
 /**
  * An expression which extracts a value from an array or matrix, as in 'm[2]'.
  */
 struct IndexExpression : public Expression {
     IndexExpression(const Context& context, std::unique_ptr<Expression> base, 
                     std::unique_ptr<Expression> index)
     : INHERITED(base->fPosition, kIndex_Kind, index_type(context, base->fType))
     , fBase(std::move(base))
     , fIndex(std::move(index)) {
-        ASSERT(fIndex->fType == *context.fInt_Type);
+        ASSERT(fIndex->fType == *context.fInt_Type || fIndex->fType == *context.fUInt_Type);
     }
 
     std::string description() const override {
         return fBase->description() + "[" + fIndex->description() + "]";
     }
 
     const std::unique_ptr<Expression> fBase;
     const std::unique_ptr<Expression> fIndex;
 
     typedef Expression INHERITED;
 };
 
 } // namespace
 
 #endif