Add a command line flag to change the default number of parallel DNS requests...

net/socket/tcp_pinger_unittest.cc

Index: net/socket/tcp_pinger_unittest.cc
===================================================================
--- net/socket/tcp_pinger_unittest.cc	(revision 52747)
+++ net/socket/tcp_pinger_unittest.cc	(working copy)
@@ -65,7 +65,8 @@
 
 TEST_F(TCPPingerTest, Ping) {
   net::AddressList addr;
-  scoped_refptr<net::HostResolver> resolver(net::CreateSystemHostResolver());
+  scoped_refptr<net::HostResolver> resolver(
+      net::CreateSystemHostResolver(net::HostResolver::kDefaultParallelism));
 
   net::HostResolver::RequestInfo info("localhost", listen_port_);
   int rv = resolver->Resolve(info, &addr, NULL, NULL, net::BoundNetLog());
@@ -78,7 +79,8 @@
 
 TEST_F(TCPPingerTest, PingFail) {
   net::AddressList addr;
-  scoped_refptr<net::HostResolver> resolver(net::CreateSystemHostResolver());
+  scoped_refptr<net::HostResolver> resolver(
+      net::CreateSystemHostResolver(net::HostResolver::kDefaultParallelism));
 
   // "Kill" "server"
   listen_sock_ = NULL;