HostResolver is exposed to plugin.

ppapi/proxy/ppb_host_resolver_private_proxy.h

Index: ppapi/proxy/ppb_host_resolver_private_proxy.h
diff --git a/ppapi/proxy/ppb_host_resolver_private_proxy.h b/ppapi/proxy/ppb_host_resolver_private_proxy.h
new file mode 100644
index 0000000000000000000000000000000000000000..4282d3d3ca14252b84a87d5873cfbad68308c049
--- /dev/null
+++ b/ppapi/proxy/ppb_host_resolver_private_proxy.h
@@ -0,0 +1,43 @@
+// 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 PPAPI_PROXY_PPB_HOST_RESOLVER_PRIVATE_PROXY_H_
+#define PPAPI_PROXY_PPB_HOST_RESOLVER_PRIVATE_PROXY_H_
+
+#include "base/basictypes.h"
+#include "ppapi/c/pp_instance.h"
+#include "ppapi/c/pp_resource.h"
+#include "ppapi/proxy/interface_proxy.h"
+#include "ppapi/shared_impl/private/ppb_host_resolver_shared.h"
+
+namespace ppapi {
+namespace proxy {
+
+class PPB_HostResolver_Private_Proxy : public InterfaceProxy {
+ public:
+  PPB_HostResolver_Private_Proxy(Dispatcher* dispatcher);
+  virtual~PPB_HostResolver_Private_Proxy();
+
+  static PP_Resource CreateProxyResource(PP_Instance instance);
+
+  // InterfaceProxy implementation.
+  virtual bool OnMessageReceived(const IPC::Message& msg);
+
+  static const ApiID kApiID = API_ID_PPB_HOSTRESOLVER_PRIVATE;
+
+ private:
+  // Browser->plugin message handlers.
+  void OnMsgResolveACK(uint32 plugin_dispatcher_id,
+                       uint32 host_resolver_id,
+                       bool succeeded,
+                       const std::string& canonical_name,
+                       const ppapi::NetAddressList& net_address_list);
+
+  DISALLOW_COPY_AND_ASSIGN(PPB_HostResolver_Private_Proxy);
+};
+
+}  // namespace proxy
+}  // namespace ppapi
+
+#endif  // PPAPI_PROXY_PPB_HOST_RESOLVER_PRIVATE_PROXY_H_