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

net/proxy/sync_host_resolver_bridge.h

Index: net/proxy/sync_host_resolver_bridge.h
===================================================================
--- net/proxy/sync_host_resolver_bridge.h	(revision 118864)
+++ net/proxy/sync_host_resolver_bridge.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.
 
@@ -24,7 +24,8 @@
 
   // SyncHostResolver methods:
   virtual int Resolve(const HostResolver::RequestInfo& info,
-                      AddressList* addresses) OVERRIDE;
+                      AddressList* addresses,
+                      const BoundNetLog& net_log) OVERRIDE;
 
   // The Shutdown() method should be called prior to destruction, from
   // |host_resolver_loop_|. It aborts any in progress synchronous resolves, to