Componentize renderer side of DNS prefetching.

components/predictor/common/predictor_messages.h

Index: components/predictor/common/predictor_messages.h
diff --git a/components/predictor/common/predictor_messages.h b/components/predictor/common/predictor_messages.h
new file mode 100644
index 0000000000000000000000000000000000000000..4bde337c19a4c6ea92bd439d6590b974b6c1523e
--- /dev/null
+++ b/components/predictor/common/predictor_messages.h
@@ -0,0 +1,21 @@
+// Copyright (c) 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 "ipc/ipc_message_macros.h"
+#include "ipc/ipc_message_utils.h"
+
+#define IPC_MESSAGE_START DnsPredictorMsgStart
+
+//-----------------------------------------------------------------------------
+// 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(DnsPredictorMsg_RequestPrefetch,
+                     std::vector<std::string> /* hostnames */)