[turbofan] Add support for advanced reducers.

test/unittests/compiler/graph-reducer-unittest.h

Index: test/unittests/compiler/graph-reducer-unittest.h
diff --git a/test/unittests/compiler/graph-reducer-unittest.h b/test/unittests/compiler/graph-reducer-unittest.h
new file mode 100644
index 0000000000000000000000000000000000000000..4cde96470969c6181598dd208135d914dc8d2bca
--- /dev/null
+++ b/test/unittests/compiler/graph-reducer-unittest.h
@@ -0,0 +1,24 @@
+// Copyright 2015 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_UNITTESTS_COMPILER_GRAPH_REDUCER_UNITTEST_H_
+#define V8_UNITTESTS_COMPILER_GRAPH_REDUCER_UNITTEST_H_
+
+#include "src/compiler/graph-reducer.h"
+#include "testing/gmock/include/gmock/gmock.h"
+
+namespace v8 {
+namespace internal {
+namespace compiler {
+
+struct MockAdvancedReducerEditor : public AdvancedReducer::Editor {
+  MOCK_METHOD1(Revisit, void(Node*));
+  MOCK_METHOD2(Replace, void(Node*, Node*));
+};
+
+}  // namespace compiler
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_UNITTESTS_COMPILER_GRAPH_REDUCER_UNITTEST_H_