HostResolver is exposed to plugin.

content/browser/renderer_host/pepper_lookup_request.h

+// 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_RENDERER_HOST_PEPPER_LOOKUP_REQUEST_H_
+#define CONTENT_BROWSER_RENDERER_HOST_PEPPER_LOOKUP_REQUEST_H_
+#pragma once
+
+#include "base/callback.h"
+#include "base/memory/scoped_ptr.h"
+#include "net/base/address_list.h"
+#include "net/base/host_resolver.h"
+#include "net/base/net_errors.h"
+#include "net/base/single_request_host_resolver.h"
+
+template<class T>
+class PepperLookupRequest {
+ public:
+  typedef base::Callback<void(int, const net::AddressList&, const T&)>
+      LookupRequestCallback;
+
+  // Takes ownership over |bound_info|. |bound_info| will be passed to
+  // callback, when lookup will finish.
+  PepperLookupRequest(net::HostResolver* resolver,
+                      const net::HostResolver::RequestInfo& request_info,
+                      T* bound_info,
+                      const LookupRequestCallback& callback)
+      : resolver_(resolver),
+        request_info_(request_info),
+        bound_info_(bound_info),
+        callback_(callback) {
+  }
+
+  void Start() {
+    int result = resolver_.Resolve(
+        request_info_, &addresses_,
+        base::Bind(&PepperLookupRequest<T>::OnLookupFinished,
+                   base::Unretained(this)),
+        net::BoundNetLog());
+    if (result != net::ERR_IO_PENDING)
+      OnLookupFinished(result);
+  }
+
+ private:
+  void OnLookupFinished(int result) {
+    callback_.Run(result, addresses_, *bound_info_);
+    delete this;
+  }
+
+  net::SingleRequestHostResolver resolver_;
+  net::HostResolver::RequestInfo request_info_;
+  scoped_ptr<T> bound_info_;
+  LookupRequestCallback callback_;
+
+  net::AddressList addresses_;
+
+  DISALLOW_COPY_AND_ASSIGN(PepperLookupRequest);
+};
+
+#endif  // CONTENT_BROWSER_RENDERER_HOST_PEPPER_LOOKUP_REQUEST_H_