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

net/base/host_resolver.h

 // 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.
 
 #ifndef NET_BASE_HOST_RESOLVER_H_
 #define NET_BASE_HOST_RESOLVER_H_
 #pragma once
 
 #include <string>
 
@@ skipping 113 matching lines @@
   };
 
   // Opaque type used to cancel a request.
   typedef void* RequestHandle;
 
   // This value can be passed into CreateSystemHostResolver as the
   // |max_concurrent_resolves| parameter. It will select a default level of
   // concurrency.
   static const size_t kDefaultParallelism = 0;
 
+  // This value can be passed into CreateSystemHostResolver as the
+  // |max_retry_attempts| parameter. This is the maximum number of times we
+  // will retry for host resolution.
+  static const size_t kDefaultRetryAttempts = -1;
+
   // If any completion callbacks are pending when the resolver is destroyed,
   // the host resolutions are cancelled, and the completion callbacks will not
   // be called.
   virtual ~HostResolver();
 
   // Resolves the given hostname (or IP address literal), filling out the
   // |addresses| object upon success.  The |info.port| parameter will be set as
   // the sin(6)_port field of the sockaddr_in{6} struct.  Returns OK if
   // successful or an error code upon failure.
   //
@@ skipping 90 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(SingleRequestHostResolver);
 };
 
 // Creates a HostResolver implementation that queries the underlying system.
 // (Except if a unit-test has changed the global HostResolverProc using
 // ScopedHostResolverProc to intercept requests to the system).
 // |max_concurrent_resolves| is how many resolve requests will be allowed to
 // run in parallel. Pass HostResolver::kDefaultParallelism to choose a
 // default value.
+// |max_retry_attempts| is the maximum number of times we will retry for host
+// resolution. Pass HostResolver::kDefaultRetryAttempts to choose a default
+// value.
 HostResolver* CreateSystemHostResolver(size_t max_concurrent_resolves,
+                                       size_t max_retry_attempts,
                                        NetLog* net_log);
 
 }  // namespace net
 
 #endif  // NET_BASE_HOST_RESOLVER_H_