Add metrics for DHCP WPAD feature.

net/proxy/dhcp_proxy_script_fetcher_win.h

Index: net/proxy/dhcp_proxy_script_fetcher_win.h
diff --git a/net/proxy/dhcp_proxy_script_fetcher_win.h b/net/proxy/dhcp_proxy_script_fetcher_win.h
index 3783971c8c0188243a0852a49df04fbe01db75a6..2a047f6abecc156ded40d03255093f698a946054 100644
--- a/net/proxy/dhcp_proxy_script_fetcher_win.h
+++ b/net/proxy/dhcp_proxy_script_fetcher_win.h
@@ -12,6 +12,7 @@
 #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"
 
@@ -44,6 +45,7 @@ class DhcpProxyScriptFetcherWin
 
  protected:
   // Event/state transition handlers
+  void CancelImpl();
   void OnFetcherDone(int result);
   void OnWaitTimer();
   void TransitionToDone();
@@ -115,6 +117,12 @@ class DhcpProxyScriptFetcherWin
 
   scoped_refptr<URLRequestContext> url_request_context_;
 
+ private:
+  // TODO(joi): Move other members to private as appropriate.
+
+  // Time |Fetch()| was last called, 0 if never.
+  base::TimeTicks fetch_start_time_;
+
   DISALLOW_IMPLICIT_CONSTRUCTORS(DhcpProxyScriptFetcherWin);
 };