Add a command line option to turn off retry attempts to resolve host

net/base/mock_host_resolver.cc

 // Copyright (c) 2011 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.
 
 #include "net/base/mock_host_resolver.h"
 
 #include "base/memory/ref_counted.h"
 #include "base/string_split.h"
 #include "base/string_util.h"
 #include "base/threading/platform_thread.h"
@@ skipping 67 matching lines @@
 
   HostCache* cache = NULL;
 
   if (use_caching_) {
     cache = new HostCache(
         100,  // max entries.
         base::TimeDelta::FromMinutes(1),
         base::TimeDelta::FromSeconds(0));
   }
 
-  impl_.reset(new HostResolverImpl(proc, cache, 50u, NULL));
+  impl_.reset(new HostResolverImpl(proc, cache, 50u, 4u, NULL));
 }
 
 int MockHostResolverBase::Resolve(const RequestInfo& info,
                                   AddressList* addresses,
                                   CompletionCallback* callback,
                                   RequestHandle* out_req,
                                   const BoundNetLog& net_log) {
   if (synchronous_mode_) {
     callback = NULL;
     out_req = NULL;
@@ skipping 208 matching lines @@
   CHECK_EQ(old_proc, current_proc_);
 }
 
 void ScopedDefaultHostResolverProc::Init(HostResolverProc* proc) {
   current_proc_ = proc;
   previous_proc_ = HostResolverProc::SetDefault(current_proc_);
   current_proc_->SetLastProc(previous_proc_);
 }
 
 }  // namespace net