Initial import.

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diff --git a/chromium/content/browser/resolve_proxy_msg_helper.h b/chromium/content/browser/resolve_proxy_msg_helper.h
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+// Copyright (c) 2012 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 CONTENT_BROWSER_RESOLVE_PROXY_MSG_HELPER_H_
+#define CONTENT_BROWSER_RESOLVE_PROXY_MSG_HELPER_H_
+
+#include <deque>
+#include <string>
+
+#include "base/memory/ref_counted.h"
+#include "content/common/content_export.h"
+#include "content/public/browser/browser_message_filter.h"
+#include "net/base/completion_callback.h"
+#include "net/proxy/proxy_service.h"
+#include "url/gurl.h"
+
+namespace net {
+class URLRequestContextGetter;
+}
+
+namespace content {
+
+// Responds to ChildProcessHostMsg_ResolveProxy, kicking off a ProxyResolve
+// request on the IO thread using the specified proxy service.  Completion is
+// notified through the delegate.  If multiple requests are started at the same
+// time, they will run in FIFO order, with only 1 being outstanding at a time.
+//
+// When an instance of ResolveProxyMsgHelper is destroyed, it cancels any
+// outstanding proxy resolve requests with the proxy service. It also deletes
+// the stored IPC::Message pointers for pending requests.
+//
+// This object is expected to live on the IO thread.
+class CONTENT_EXPORT ResolveProxyMsgHelper : public BrowserMessageFilter {
+ public:
+  explicit ResolveProxyMsgHelper(net::URLRequestContextGetter* getter);
+  // Constructor used by unittests.
+  explicit ResolveProxyMsgHelper(net::ProxyService* proxy_service);
+
+  // BrowserMessageFilter implementation
+  virtual bool OnMessageReceived(const IPC::Message& message,
+                                 bool* message_was_ok) OVERRIDE;
+
+  void OnResolveProxy(const GURL& url, IPC::Message* reply_msg);
+
+ protected:
+  // Destruction cancels the current outstanding request, and clears the
+  // pending queue.
+  virtual ~ResolveProxyMsgHelper();
+
+ private:
+  // Callback for the ProxyService (bound to |callback_|).
+  void OnResolveProxyCompleted(int result);
+
+  // Starts the first pending request.
+  void StartPendingRequest();
+
+  // A PendingRequest is a resolve request that is in progress, or queued.
+  struct PendingRequest {
+   public:
+     PendingRequest(const GURL& url, IPC::Message* reply_msg) :
+         url(url), reply_msg(reply_msg), pac_req(NULL) { }
+
+     // The URL of the request.
+     GURL url;
+
+     // Data to pass back to the delegate on completion (we own it until then).
+     IPC::Message* reply_msg;
+
+     // Handle for cancelling the current request if it has started (else NULL).
+     net::ProxyService::PacRequest* pac_req;
+  };
+
+  // Info about the current outstanding proxy request.
+  net::ProxyInfo proxy_info_;
+
+  // FIFO queue of pending requests. The first entry is always the current one.
+  typedef std::deque<PendingRequest> PendingRequestList;
+  PendingRequestList pending_requests_;
+
+  scoped_refptr<net::URLRequestContextGetter> context_getter_;
+  net::ProxyService* proxy_service_;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_RESOLVE_PROXY_MSG_HELPER_H_