Make the simple QUIC client able to resolve hosts.

net/tools/quic/synchronous_host_resolver.h

Index: net/tools/quic/synchronous_host_resolver.h
diff --git a/net/tools/quic/synchronous_host_resolver.h b/net/tools/quic/synchronous_host_resolver.h
new file mode 100644
index 0000000000000000000000000000000000000000..258c8e4dedc9f93e8950091e3363b7c235d93bcf
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+++ b/net/tools/quic/synchronous_host_resolver.h
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+// Copyright (c) 2015 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.
+//
+// A simple class for resolving hostname synchronously.
+
+#ifndef NET_TOOLS_QUIC_SYNCHRONOUS_HOST_RESOLVER_H_
+#define NET_TOOLS_QUIC_SYNCHRONOUS_HOST_RESOLVER_H_
+
+#include "net/base/address_list.h"
+#include "net/base/net_export.h"
+#include "net/dns/host_resolver.h"
+
+namespace net {
+
+namespace tools {
+
+class SynchronousHostResolver {
+ public:
+  static int Resolve(const std::string& host, AddressList* addresses);
+};
+
+}  // namespace tools
+}  // namespace net
+
+#endif  // NET_TOOLS_QUIC_SYNCHRONOUS_HOST_RESOLVER_H_