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diff --git a/deps/v8/src/compiler/js-native-context-specialization.h b/deps/v8/src/compiler/js-native-context-specialization.h
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+// 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_COMPILER_JS_NATIVE_CONTEXT_SPECIALIZATION_H_
+#define V8_COMPILER_JS_NATIVE_CONTEXT_SPECIALIZATION_H_
+
+#include "src/base/flags.h"
+#include "src/compiler/access-info.h"
+#include "src/compiler/graph-reducer.h"
+
+namespace v8 {
+namespace internal {
+
+// Forward declarations.
+class CompilationDependencies;
+class Factory;
+class FeedbackNexus;
+class TypeCache;
+
+
+namespace compiler {
+
+// Forward declarations.
+class CommonOperatorBuilder;
+class JSGraph;
+class JSOperatorBuilder;
+class MachineOperatorBuilder;
+class SimplifiedOperatorBuilder;
+
+
+// Specializes a given JSGraph to a given native context, potentially constant
+// folding some {LoadGlobal} nodes or strength reducing some {StoreGlobal}
+// nodes.  And also specializes {LoadNamed} and {StoreNamed} nodes according
+// to type feedback (if available).
+class JSNativeContextSpecialization final : public AdvancedReducer {
+ public:
+  // Flags that control the mode of operation.
+  enum Flag {
+    kNoFlags = 0u,
+    kDeoptimizationEnabled = 1u << 0,
+  };
+  typedef base::Flags<Flag> Flags;
+
+  JSNativeContextSpecialization(Editor* editor, JSGraph* jsgraph, Flags flags,
+                                Handle<Context> native_context,
+                                CompilationDependencies* dependencies,
+                                Zone* zone);
+
+  Reduction Reduce(Node* node) final;
+
+ private:
+  Reduction ReduceJSCallFunction(Node* node);
+  Reduction ReduceJSLoadNamed(Node* node);
+  Reduction ReduceJSStoreNamed(Node* node);
+  Reduction ReduceJSLoadProperty(Node* node);
+  Reduction ReduceJSStoreProperty(Node* node);
+
+  Reduction ReduceElementAccess(Node* node, Node* index, Node* value,
+                                MapHandleList const& receiver_maps,
+                                AccessMode access_mode,
+                                LanguageMode language_mode);
+  Reduction ReduceKeyedAccess(Node* node, Node* index, Node* value,
+                              FeedbackNexus const& nexus,
+                              AccessMode access_mode,
+                              LanguageMode language_mode);
+  Reduction ReduceNamedAccess(Node* node, Node* value,
+                              MapHandleList const& receiver_maps,
+                              Handle<Name> name, AccessMode access_mode,
+                              LanguageMode language_mode,
+                              Node* index = nullptr);
+
+  // Adds stability dependencies on all prototypes of every class in
+  // {receiver_type} up to (and including) the {holder}.
+  void AssumePrototypesStable(Type* receiver_type, Handle<JSObject> holder);
+
+  // Assuming that {if_projection} is either IfTrue or IfFalse, adds a hint on
+  // the dominating Branch that {if_projection} is the unlikely (deferred) case.
+  void MarkAsDeferred(Node* if_projection);
+
+  Graph* graph() const;
+  JSGraph* jsgraph() const { return jsgraph_; }
+  Isolate* isolate() const;
+  Factory* factory() const;
+  CommonOperatorBuilder* common() const;
+  JSOperatorBuilder* javascript() const;
+  SimplifiedOperatorBuilder* simplified() const;
+  MachineOperatorBuilder* machine() const;
+  Flags flags() const { return flags_; }
+  Handle<Context> native_context() const { return native_context_; }
+  CompilationDependencies* dependencies() const { return dependencies_; }
+  Zone* zone() const { return zone_; }
+  AccessInfoFactory& access_info_factory() { return access_info_factory_; }
+
+  JSGraph* const jsgraph_;
+  Flags const flags_;
+  Handle<Context> native_context_;
+  CompilationDependencies* const dependencies_;
+  Zone* const zone_;
+  TypeCache const& type_cache_;
+  AccessInfoFactory access_info_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(JSNativeContextSpecialization);
+};
+
+DEFINE_OPERATORS_FOR_FLAGS(JSNativeContextSpecialization::Flags)
+
+}  // namespace compiler
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_COMPILER_JS_NATIVE_CONTEXT_SPECIALIZATION_H_