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diff --git a/chromium/v8/src/arm64/lithium-gap-resolver-arm64.h b/chromium/v8/src/arm64/lithium-gap-resolver-arm64.h
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+++ b/chromium/v8/src/arm64/lithium-gap-resolver-arm64.h
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+// Copyright 2013 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_ARM64_LITHIUM_GAP_RESOLVER_ARM64_H_
+#define V8_ARM64_LITHIUM_GAP_RESOLVER_ARM64_H_
+
+#include "src/v8.h"
+
+#include "src/lithium.h"
+
+namespace v8 {
+namespace internal {
+
+class LCodeGen;
+class LGapResolver;
+
+class LGapResolver BASE_EMBEDDED {
+ public:
+  explicit LGapResolver(LCodeGen* owner);
+
+  // Resolve a set of parallel moves, emitting assembler instructions.
+  void Resolve(LParallelMove* parallel_move);
+
+ private:
+  // Build the initial list of moves.
+  void BuildInitialMoveList(LParallelMove* parallel_move);
+
+  // Perform the move at the moves_ index in question (possibly requiring
+  // other moves to satisfy dependencies).
+  void PerformMove(int index);
+
+  // If a cycle is found in the series of moves, save the blocking value to
+  // a scratch register.  The cycle must be found by hitting the root of the
+  // depth-first search.
+  void BreakCycle(int index);
+
+  // After a cycle has been resolved, restore the value from the scratch
+  // register to its proper destination.
+  void RestoreValue();
+
+  // Emit a move and remove it from the move graph.
+  void EmitMove(int index);
+
+  // Emit a move from one stack slot to another.
+  void EmitStackSlotMove(int index);
+
+  // Verify the move list before performing moves.
+  void Verify();
+
+  LCodeGen* cgen_;
+
+  // List of moves not yet resolved.
+  ZoneList<LMoveOperands> moves_;
+
+  int root_index_;
+  bool in_cycle_;
+  LOperand* saved_destination_;
+
+  // We use the root register as a scratch in a few places. When that happens,
+  // this flag is set to indicate that it needs to be restored.
+  bool need_to_restore_root_;
+};
+
+} }  // namespace v8::internal
+
+#endif  // V8_ARM64_LITHIUM_GAP_RESOLVER_ARM64_H_