initial checkin of SkSL compiler
BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1984363002
CQ_EXTRA_TRYBOTS=client.skia.compile:Build-Ubuntu-GCC-x86_64-Release-CMake-Trybot,Build-Mac-Clang-x86_64-Release-CMake-Trybot
Review-Url: https://codereview.chromium.org/1984363002
diff --git a/src/sksl/ast/SkSLASTIdentifier.h b/src/sksl/ast/SkSLASTIdentifier.h
new file mode 100644
index 0000000..d67f64d
--- /dev/null
+++ b/src/sksl/ast/SkSLASTIdentifier.h
@@ -0,0 +1,34 @@
+/*
+ * 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_ASTIDENTIFIER
+#define SKSL_ASTIDENTIFIER
+
+#include "SkSLASTExpression.h"
+
+namespace SkSL {
+
+/**
+ * An identifier in an expression context.
+ */
+struct ASTIdentifier : public ASTExpression {
+ ASTIdentifier(Position position, std::string text)
+ : INHERITED(position, kIdentifier_Kind)
+ , fText(std::move(text)) {}
+
+ std::string description() const override {
+ return fText;
+ }
+
+ const std::string fText;
+
+ typedef ASTExpression INHERITED;
+};
+
+} // namespace
+
+#endif