AsyncHostResolver: integrated HostCache, temporarily, until we have RR cache.

net/base/address_list.cc

Index: net/base/address_list.cc
diff --git a/net/base/address_list.cc b/net/base/address_list.cc
index f9076bc6a9e6f2975ab230a662f5e286a6a5e3c8..85bd012182a80028cbc705625e861251d1531aa9 100644
--- a/net/base/address_list.cc
+++ b/net/base/address_list.cc
@@ -279,4 +279,13 @@ AddressList::Data::~Data() {
     FreeCopyOfAddrinfo(mutable_head);
 }
 
+AddressList CreateAddressListUsingPort(const AddressList& src, int port) {
+  if (src.GetPort() == port)
+    return src;
+
+  AddressList out = src;
+  out.SetPort(port);
+  return out;
+}
+
 }  // namespace net