Add the capability to run multiple proxy PAC scripts in parallel....

net/proxy/proxy_resolver.h

 // Copyright (c) 2009 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_RESOLVER_H_
 #define NET_PROXY_PROXY_RESOLVER_H_
 
 #include "base/logging.h"
 #include "base/string16.h"
 #include "googleurl/src/gurl.h"
@@ skipping 56 matching lines @@
   // TODO(eroman): Make this =0.
   virtual void CancelSetPacScript() {
     NOTREACHED();
   }
 
   // Frees any unneeded memory held by the resolver, e.g. garbage in the JS
   // engine.  Most subclasses don't need to do anything, so we provide a default
   // no-op implementation.
   virtual void PurgeMemory() {}
 
+  // Optional shutdown code to be run before destruction. This is only used
+  // by the multithreaded runner to signal cleanup from origin thread
+  virtual void Shutdown() {}
+
  private:
   // Called to set the PAC script backend to use. If |pac_url| is invalid,
   // this is a request to use WPAD (auto detect). |pac_script| may be empty if
   // the fetch failed, or if the fetch returned no content.
   // Returns ERR_IO_PENDING in the case of asynchronous completion, and notifies
   // the result through |callback|.
   virtual int SetPacScript(const GURL& pac_url,
                            const string16& pac_script,
                            CompletionCallback* callback) = 0;
 
   const bool expects_pac_bytes_;
 
   DISALLOW_COPY_AND_ASSIGN(ProxyResolver);
 };
 
 }  // namespace net
 
 #endif  // NET_PROXY_PROXY_RESOLVER_H_