Add LoadState reporting to the mojo proxy resolver.

net/proxy/proxy_resolver.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_H_
 #define NET_PROXY_PROXY_RESOLVER_H_
 
+#include "base/callback_forward.h"
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
 #include "base/strings/string16.h"
 #include "net/base/completion_callback.h"
 #include "net/base/load_states.h"
 #include "net/base/net_export.h"
 #include "net/proxy/proxy_resolver_script_data.h"
 #include "url/gurl.h"
 
 namespace net {
 
 class BoundNetLog;
 class ProxyInfo;
 
 // Interface for "proxy resolvers". A ProxyResolver fills in a list of proxies
 // to use for a particular URL. Generally the backend for a ProxyResolver is
 // a PAC script, but it doesn't need to be. ProxyResolver can service multiple
 // requests at a time.
 class NET_EXPORT_PRIVATE ProxyResolver {
  public:
   // Opaque pointer type, to return a handle to cancel outstanding requests.
   typedef void* RequestHandle;
 
+  using LoadStateChangedCallback =
+      const base::Callback<void(RequestHandle, LoadState)>;
+
   // See |expects_pac_bytes()| for the meaning of |expects_pac_bytes|.
   explicit ProxyResolver(bool expects_pac_bytes)
       : expects_pac_bytes_(expects_pac_bytes) {}
 
   virtual ~ProxyResolver() {}
 
   // Gets a list of proxy servers to use for |url|. If the request will
   // complete asynchronously returns ERR_IO_PENDING and notifies the result
   // by running |callback|.  If the result code is OK then
   // the request was successful and |results| contains the proxy
@@ skipping 28 matching lines @@
 
  private:
   const bool expects_pac_bytes_;
 
   DISALLOW_COPY_AND_ASSIGN(ProxyResolver);
 };
 
 }  // namespace net
 
 #endif  // NET_PROXY_PROXY_RESOLVER_H_