Add metrics for DHCP WPAD feature.

net/proxy/dhcp_proxy_script_fetcher_win.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_DHCP_PROXY_SCRIPT_FETCHER_WIN_H_
 #define NET_PROXY_DHCP_PROXY_SCRIPT_FETCHER_WIN_H_
 #pragma once
 
 #include <set>
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/scoped_vector.h"
 #include "base/threading/non_thread_safe.h"
+#include "base/time.h"
 #include "base/timer.h"
 #include "net/proxy/dhcp_proxy_script_fetcher.h"
 
 namespace net {
 
 class DhcpProxyScriptAdapterFetcher;
 class URLRequestContext;
 
 // Windows-specific implementation.
 class DhcpProxyScriptFetcherWin
@@ skipping 12 matching lines @@
   const GURL& GetPacURL() const OVERRIDE;
   std::string GetFetcherName() const OVERRIDE;
 
   // Sets |adapter_names| to contain the name of each network adapter on
   // this machine that has DHCP enabled and is not a loop-back adapter. Returns
   // false on error.
   static bool GetCandidateAdapterNames(std::set<std::string>* adapter_names);
 
  protected:
   // Event/state transition handlers
+  void CancelImpl(bool user_initiated);
   void OnFetcherDone(int result);
   void OnWaitTimer();
   void TransitionToDone();
 
   // Virtual methods introduced to allow unit testing.
   virtual DhcpProxyScriptAdapterFetcher* ImplCreateAdapterFetcher();
   virtual bool ImplGetCandidateAdapterNames(
       std::set<std::string>* adapter_names);
   virtual int ImplGetMaxWaitMs();
 
@@ skipping 49 matching lines @@
 
   // Pointer to string we will write results to. Not valid in states
   // START and DONE.
   string16* destination_string_;
 
   // PAC URL retrieved from DHCP, if any. Valid only in state STATE_DONE.
   GURL pac_url_;
 
   base::OneShotTimer<DhcpProxyScriptFetcherWin> wait_timer_;
 
+  // Time |Fetch()| was last called, 0 if never.
+  base::TimeTicks fetch_start_time_;
+
   scoped_refptr<URLRequestContext> url_request_context_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(DhcpProxyScriptFetcherWin);
 };
 
 }  // namespace net
 
 #endif  // NET_PROXY_DHCP_PROXY_SCRIPT_FETCHER_WIN_H_