Support replacement of IP address resolutions via command line flag

content/public/common/content_switches.cc

Index: content/public/common/content_switches.cc
diff --git a/content/public/common/content_switches.cc b/content/public/common/content_switches.cc
index 285b5de5e4528dcb9b4e523f68bf3b6d6c195775..19779fbeb2109c8aeec6db4fcf0cf6fb9b7fce88 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -687,6 +687,10 @@ const char kIgnoreGpuBlacklist[]            = "ignore-gpu-blacklist";
 // Run the GPU process as a thread in the browser process.
 const char kInProcessGPU[]                  = "in-process-gpu";
 
+// These mappings only apply to the host resolver, and can insert additional
+// resolutions in front of resolutions that match a pattern.
+const char kIpResolverRules[]               = "ip-resolver-rules";
+
 // Specifies the flags passed to JS engine
 const char kJavaScriptFlags[]               = "js-flags";