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diff --git a/net/proxy/proxy_resolver_v8.h b/net/proxy/proxy_resolver_v8.h
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+++ b/net/proxy/proxy_resolver_v8.h
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+// Copyright (c) 2009 The Chromium 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 NET_PROXY_PROXY_RESOLVER_V8_H_
+#define NET_PROXY_PROXY_RESOLVER_V8_H_
+
+#include <string>
+
+#include "base/scoped_ptr.h"
+#include "net/proxy/proxy_service.h"
+
+namespace net {
+
+// Implementation of ProxyResolver that uses V8 to evaluate PAC scripts.
+//
+// ----------------------------------------------------------------------------
+// !!! Important note on threading model:
+// ----------------------------------------------------------------------------
+// There can be only one instance of V8 running at a time. To enforce this
+// constraint, ProxyResolverV8 holds a v8::Locker during execution. Therefore
+// it is OK to run multiple instances of ProxyResolverV8 on different threads,
+// since only one will be running inside V8 at a time.
+//
+// It is important that *ALL* instances of V8 in the process be using
+// v8::Locker. If not there can be race conditions beween the non-locked V8
+// instances and the locked V8 instances used by ProxyResolverV8 (assuming they
+// run on different threads).
+//
+// This is the case with the V8 instance used by chromium's renderer -- it runs
+// on a different thread from ProxyResolver (renderer thread vs PAC thread),
+// and does not use locking since it expects to be alone.
+class ProxyResolverV8 : public ProxyResolver {
+ public:
+  ProxyResolverV8();
+  ~ProxyResolverV8();
+
+  // ProxyResolver implementation:
+  virtual int GetProxyForURL(const GURL& query_url,
+                             const GURL& /*pac_url*/,
+                             ProxyInfo* results);
+  virtual void SetPacScript(const std::string& bytes);
+
+ private:
+  // Context holds the Javascript state for the most recently loaded PAC
+  // script. It corresponds with the data from the last call to
+  // SetPacScript().
+  class Context;
+  scoped_ptr<Context> context_;
+
+  DISALLOW_COPY_AND_ASSIGN(ProxyResolverV8);
+};
+
+}  // namespace net
+
+#endif  // NET_PROXY_PROXY_RESOLVER_V8_H_