Synchronize events of CFNetworkExecuteProxyAutoConfigurationURL

net/proxy/proxy_resolver_mac.h

 // Copyright (c) 2011 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_MAC_H_
 #define NET_PROXY_PROXY_RESOLVER_MAC_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "net/base/net_export.h"
 #include "net/proxy/proxy_resolver_factory.h"
 #include "url/gurl.h"
 
 namespace net {
 
 // Implementation of ProxyResolverFactory that uses the Mac CFProxySupport to
 // implement proxies.
+// TODO(kapishnikov): make ProxyResolverMac async as per
+// https://bugs.chromium.org/p/chromium/issues/detail?id=166387#c95
 class NET_EXPORT ProxyResolverFactoryMac : public ProxyResolverFactory {
  public:
   ProxyResolverFactoryMac();
 
   int CreateProxyResolver(
       const scoped_refptr<ProxyResolverScriptData>& pac_script,
       std::unique_ptr<ProxyResolver>* resolver,
       const CompletionCallback& callback,
       std::unique_ptr<Request>* request) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ProxyResolverFactoryMac);
 };
 
 }  // namespace net
 
 #endif  // NET_PROXY_PROXY_RESOLVER_MAC_H_