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

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
===================================================================
--- chrome/common/chrome_switches.cc	(revision 85651)
+++ chrome/common/chrome_switches.cc	(working copy)
@@ -601,9 +601,15 @@
 // proxy connection, and the endpoint host in a SOCKS proxy connection).
 const char kHostRules[]                     = "host-rules";
 
-// The maximum number of concurrent host resolve requests (i.e. DNS) to allow.
+// The maximum number of concurrent host resolve requests (i.e. DNS) to allow
+// (not counting backup attempts which would also consume threads).
+// --host-resolver-retry-attempts must be set to zero for this to be exact.
 const char kHostResolverParallelism[]       = "host-resolver-parallelism";
 
+// The maximum number of retry attempts to resolve the host. Set this to zero
+// to disable host resolver retry attempts.
+const char kHostResolverRetryAttempts[]     = "host-resolver-retry-attempts";
+
 // These mappings only apply to the host resolver.
 const char kHostResolverRules[]             = "host-resolver-rules";