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

net/base/host_resolver.h

Index: net/base/host_resolver.h
===================================================================
--- net/base/host_resolver.h	(revision 85651)
+++ net/base/host_resolver.h	(working copy)
@@ -131,6 +131,11 @@
   // 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.
@@ -241,7 +246,11 @@
 // |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