Turned on SkSL->GLSL compiler

src/sksl/ast/SkSLASTIndexSuffix.h

Index: src/sksl/ast/SkSLASTIndexSuffix.h
diff --git a/src/sksl/ast/SkSLASTIndexSuffix.h b/src/sksl/ast/SkSLASTIndexSuffix.h
index 44d91fa4c4c11e4da9270bbab49130ebe9f49092..755029b0a212ffa03d744760627dd7c85907fb88 100644
--- a/src/sksl/ast/SkSLASTIndexSuffix.h
+++ b/src/sksl/ast/SkSLASTIndexSuffix.h
@@ -14,17 +14,27 @@
 namespace SkSL {
 
 /**
- * A bracketed expression, as in '[0]', indicating an array access. 
+ * A bracketed expression, as in '[0]', indicating an array access. Empty brackets (as occur in
+ * 'float[](5, 6)' are represented with a null fExpression.
  */
 struct ASTIndexSuffix : public ASTSuffix {
+    ASTIndexSuffix(Position position) 
+    : INHERITED(position, ASTSuffix::kIndex_Kind)
+    , fExpression(nullptr) {}
+
     ASTIndexSuffix(std::unique_ptr<ASTExpression> expression) 
-    : INHERITED(expression->fPosition, ASTSuffix::kIndex_Kind)
+    : INHERITED(expression ? expression->fPosition : Position(), ASTSuffix::kIndex_Kind)
     , fExpression(std::move(expression)) {}
 
     std::string description() const override {
-        return "[" + fExpression->description() + "]";
+        if (fExpression) {
+            return "[" + fExpression->description() + "]";
+        } else {
+            return "[]";
+        }
     }
 
+    // may be null
     std::unique_ptr<ASTExpression> fExpression;
 
     typedef ASTSuffix INHERITED;