initial checkin of SkSL compiler

src/sksl/SkSLPosition.h

Index: src/sksl/SkSLPosition.h
diff --git a/src/sksl/SkSLPosition.h b/src/sksl/SkSLPosition.h
new file mode 100644
index 0000000000000000000000000000000000000000..979f630ae7b0c43a071b2f2434f9bd2e2645a0d0
--- /dev/null
+++ b/src/sksl/SkSLPosition.h
@@ -0,0 +1,38 @@
+/*
+ * 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_POSITION
+#define SKSL_POSITION
+
+#include "SkSLUtil.h"
+
+namespace SkSL {
+
+/**
+ * Represents a position in the source code. Both line and column are one-based. Column is currently
+ * ignored.
+ */
+struct Position {
+    Position() 
+    : fLine(-1)
+    , fColumn(-1) {}
+    
+    Position(int line, int column)
+    : fLine(line)
+    , fColumn(column) {}
+
+    std::string description() const {
+        return to_string(fLine);
+    }
+
+    int fLine;
+    int fColumn;
+};
+
+} // namespace
+
+#endif