Add a source to V8 proxy resolver-initiated DNS requests,

net/proxy/sync_host_resolver.h

Index: net/proxy/sync_host_resolver.h
===================================================================
--- net/proxy/sync_host_resolver.h	(revision 118864)
+++ net/proxy/sync_host_resolver.h	(working copy)
@@ -1,4 +1,4 @@
-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2012 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.
 
@@ -11,6 +11,8 @@
 
 namespace net {
 
+class BoundNetLog;
+
 // Interface used by ProxyResolverJSBindings to abstract a synchronous host
 // resolver module (which includes a Shutdown method).
 class NET_EXPORT_PRIVATE SyncHostResolver {
@@ -18,7 +20,8 @@
   virtual ~SyncHostResolver() {}
 
   virtual int Resolve(const HostResolver::RequestInfo& info,
-                      AddressList* addresses) = 0;
+                      AddressList* addresses,
+                      const BoundNetLog& net_log) = 0;
 
   // Optionally aborts any blocking resolves that are in progress.
   virtual void Shutdown() = 0;