Start using the proxy resolve IPC for plugins....

net/proxy/proxy_service.h

 // Copyright (c) 2006-2008 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 NET_PROXY_PROXY_SERVICE_H_
 #define NET_PROXY_PROXY_SERVICE_H_
 
 #include <map>
 #include <vector>
 
 #include "base/ref_counted.h"
 #include "base/scoped_ptr.h"
 #include "base/string_util.h"
 #include "base/thread.h"
 #include "base/time.h"
+#include "base/waitable_event.h"
 #include "googleurl/src/gurl.h"
 #include "net/base/completion_callback.h"
 
 #if defined(OS_WIN)
 typedef LPVOID HINTERNET;  // From winhttp.h
 #endif
 
 class GURL;
 
 namespace net {
@@ skipping 279 matching lines @@
   virtual ~ProxyResolver() {}
 
   // Query the proxy auto-config file (specified by |pac_url|) for the proxy to
   // use to load the given |query_url|.  Returns OK if successful or an error
   // code otherwise.
   virtual int GetProxyForURL(const GURL& query_url,
                              const GURL& pac_url,
                              ProxyInfo* results) = 0;
 };
 
+// Wrapper for invoking methods on a ProxyService synchronously.
+class SyncProxyServiceHelper
+    : public base::RefCountedThreadSafe<SyncProxyServiceHelper> {
+ public:
+  SyncProxyServiceHelper(MessageLoop* io_message_loop,
+                         ProxyService* proxy_service);
+
+  int ResolveProxy(const GURL& url, ProxyInfo* proxy_info);
+  int ReconsiderProxyAfterError(const GURL& url, ProxyInfo* proxy_info);
+
+ private:
+  void StartAsyncResolve(const GURL& url);
+  void StartAsyncReconsider(const GURL& url);
+
+  void OnCompletion(int result);
+
+  MessageLoop* io_message_loop_;
+  ProxyService* proxy_service_;
+
+  base::WaitableEvent event_;
+  CompletionCallbackImpl<SyncProxyServiceHelper> callback_;
+  ProxyInfo proxy_info_;
+  int result_;
+};
+
 }  // namespace net
 
 #endif  // NET_PROXY_PROXY_SERVICE_H_