Layout Tests should support '*.test' URLs.

content/shell/app/shell_main_delegate.cc

Index: content/shell/app/shell_main_delegate.cc
diff --git a/content/shell/app/shell_main_delegate.cc b/content/shell/app/shell_main_delegate.cc
index 273ca2f1af828d41c5d66a6252d56bad935836ae..bf3fa110fc0e26fbbf9dad091f36fae06e3f861a 100644
--- a/content/shell/app/shell_main_delegate.cc
+++ b/content/shell/app/shell_main_delegate.cc
@@ -176,6 +176,9 @@ bool ShellMainDelegate::BasicStartupComplete(int* exit_code) {
 
     command_line.AppendSwitch(switches::kEnablePreciseMemoryInfo);
 
+    command_line.AppendSwitchASCII(switches::kHostResolverRules,
+                                   "MAP *.test 127.0.0.1");
+
     // Unless/until WebM files are added to the media layout tests, we need to
     // avoid removing MP4/H264/AAC so that layout tests can run on Android.
 #if !defined(OS_ANDROID)