Componentize renderer side of DNS prefetching.

components/dns_prefetch/common/prefetch_messages.h

Index: components/dns_prefetch/common/prefetch_messages.h
diff --git a/components/dns_prefetch/common/prefetch_messages.h b/components/dns_prefetch/common/prefetch_messages.h
new file mode 100644
index 0000000000000000000000000000000000000000..d12ac74e2ac5c5a89d432c1f124dfe50a3c87819
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+++ b/components/dns_prefetch/common/prefetch_messages.h
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+// Copyright 2014 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.
+
+// Multiply-included file, no traditional include guard.
+#include <string>
+#include <vector>
+
+#include "components/dns_prefetch/common/prefetch_common.h"
+#include "ipc/ipc_message_macros.h"
+#include "ipc/ipc_message_utils.h"
+
+// Singly-included section for custom IPC traits.
+#ifndef COMPONENTS_DNS_PREFETCH_COMMON_PREFETCH_MESSAGES_H_
+#define COMPONENTS_DNS_PREFETCH_COMMON_PREFETCH_MESSAGES_H_
+
+namespace IPC {
+
+template <>
+struct ParamTraits<dns_prefetch::LookupRequest> {
+  typedef dns_prefetch::LookupRequest param_type;
+  static void Write(Message* m, const param_type& p);
+  static bool Read(const Message* m, PickleIterator* iter, param_type* r);
+  static void Log(const param_type& p, std::string* l);
+};
+
+}  // namespace IPC
+
+#endif  // COMPONENTS_DNS_PREFETCH_COMMON_PREFETCH_MESSAGES_H_
+
+#define IPC_MESSAGE_START DnsPrefetchMsgStart
+
+//-----------------------------------------------------------------------------
+// Host messages
+// These are messages sent from the renderer process to the browser process.
+
+// Request for a DNS prefetch of the names in the array.
+// NameList is typedef'ed std::vector<std::string>
+IPC_MESSAGE_CONTROL1(DnsPrefetchMsg_RequestPrefetch,
+                     dns_prefetch::LookupRequest)