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diff --git a/deps/v8/src/compiler/lowering-builder.h b/deps/v8/src/compiler/lowering-builder.h
new file mode 100644
index 000000000..aeaaaacfd
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+++ b/deps/v8/src/compiler/lowering-builder.h
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+// Copyright 2014 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef V8_COMPILER_LOWERING_BUILDER_H_
+#define V8_COMPILER_LOWERING_BUILDER_H_
+
+#include "src/v8.h"
+
+#include "src/compiler/graph.h"
+
+
+namespace v8 {
+namespace internal {
+namespace compiler {
+
+// TODO(dcarney): rename this class.
+class LoweringBuilder {
+ public:
+  explicit LoweringBuilder(Graph* graph, SourcePositionTable* source_positions);
+  virtual ~LoweringBuilder() {}
+
+  void LowerAllNodes();
+  virtual void Lower(Node* node) = 0;  // Exposed for testing.
+
+  Graph* graph() const { return graph_; }
+
+ private:
+  class NodeVisitor;
+  Graph* graph_;
+  SourcePositionTable* source_positions_;
+};
+
+}  // namespace compiler
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_COMPILER_LOWERING_BUILDER_H_