Track sources of proxy settings.

net/proxy/proxy_list.cc

Index: net/proxy/proxy_list.cc
diff --git a/net/proxy/proxy_list.cc b/net/proxy/proxy_list.cc
index cdc8cc2b4a922ea4b63a7a7c6f624c0f6b4bf4c3..d4867e0a7cb1ab55ac9173fd982282b551728e65 100644
--- a/net/proxy/proxy_list.cc
+++ b/net/proxy/proxy_list.cc
@@ -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.
 
@@ -77,10 +77,18 @@ void ProxyList::RemoveProxiesWithoutScheme(int scheme_bit_field) {
   }
 }
 
+void ProxyList::Clear() {
+  proxies_.clear();
+}
+
 bool ProxyList::IsEmpty() const {
   return proxies_.empty();
 }
 
+size_t ProxyList::size() const {
+  return proxies_.size();
+}
+
 const ProxyServer& ProxyList::Get() const {
   DCHECK(!proxies_.empty());
   return proxies_[0];