Fast-fail WPAD detection.

net/proxy/proxy_script_decider.h

Index: net/proxy/proxy_script_decider.h
diff --git a/net/proxy/proxy_script_decider.h b/net/proxy/proxy_script_decider.h
index 9a77938ec8e4aef834281184e16d1d55913b9b3c..e892e524463f63f8ab4df4a2a6dc25d5cd50dfb5 100644
--- a/net/proxy/proxy_script_decider.h
+++ b/net/proxy/proxy_script_decider.h
@@ -12,9 +12,12 @@
 #include "base/strings/string16.h"
 #include "base/time/time.h"
 #include "base/timer/timer.h"
+#include "net/base/address_list.h"
 #include "net/base/completion_callback.h"
 #include "net/base/net_export.h"
 #include "net/base/net_log.h"
+#include "net/dns/host_resolver.h"
+#include "net/dns/single_request_host_resolver.h"
 #include "net/proxy/proxy_config.h"
 #include "net/proxy/proxy_resolver.h"
 #include "url/gurl.h"
@@ -105,10 +108,13 @@ class NET_EXPORT_PRIVATE ProxyScriptDecider {
     STATE_NONE,
     STATE_WAIT,
     STATE_WAIT_COMPLETE,
+    STATE_QUICK_CHECK,
+    STATE_QUICK_CHECK_COMPLETE,
     STATE_FETCH_PAC_SCRIPT,
     STATE_FETCH_PAC_SCRIPT_COMPLETE,
     STATE_VERIFY_PAC_SCRIPT,
     STATE_VERIFY_PAC_SCRIPT_COMPLETE,
+    STATE_FAILED,

[szym, 2013/08/26 17:24:31]

You don't need STATE_FAILED. Remove.

[Elly Fong-Jones, 2013/09/09 22:07:42]

Done.

   };
 
   // Returns ordered list of PAC urls to try for |config|.
@@ -121,6 +127,9 @@ class NET_EXPORT_PRIVATE ProxyScriptDecider {
   int DoWait();
   int DoWaitComplete(int result);
 
+  int DoQuickCheck();
+  int DoQuickCheckComplete(int result);
+
   int DoFetchPacScript();
   int DoFetchPacScriptComplete(int result);
 
@@ -175,6 +184,10 @@ class NET_EXPORT_PRIVATE ProxyScriptDecider {
   ProxyConfig effective_config_;
   scoped_refptr<ProxyResolverScriptData> script_data_;
 
+  AddressList wpad_addresses_;
+  base::OneShotTimer<ProxyScriptDecider> quick_check_timer_;
+  SingleRequestHostResolver host_resolver_;
+  base::Time quick_check_start_time_;
 
   DISALLOW_COPY_AND_ASSIGN(ProxyScriptDecider);
 };