initial checkin of SkSL compiler

src/sksl/ir/SkSLProgram.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_PROGRAM
+#define SKSL_PROGRAM
+
+#include <vector>
+#include <memory>
+
+#include "SkSLProgramElement.h"
+
+namespace SkSL {
+
+/**
+ * Represents a fully-digested program, ready for code generation.
+ */
+struct Program {
+    enum Kind {
+        kFragment_Kind,
+        kVertex_Kind
+    };
+
+    Program(Kind kind, std::vector<std::unique_ptr<ProgramElement>> elements)
+    : fKind(kind) 
+    , fElements(std::move(elements)) {}
+
+    Kind fKind;
+
+    std::vector<std::unique_ptr<ProgramElement>> fElements;
+};
+
+} // namespace
+
+#endif