[net] Add AsyncDns field trial.

chrome/browser/about_flags.cc

Index: chrome/browser/about_flags.cc
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index 54438cdd50dd3383b86b8665f08f9d24703a02c9..aa4c0cda4dfeba4c8cc54660100c72d43c89277f 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -148,6 +148,14 @@ const Experiment::Choice kPointerLockUIChoices[] = {
     switches::kDisablePointerLock, ""}
 };
 
+const Experiment::Choice kAsyncDnsChoices[] = {
+  { IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", "" },
+  { IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
+    switches::kDisableAsyncDns, ""},
+  { IDS_GENERIC_EXPERIMENT_CHOICE_ENABLED,
+    switches::kEnableAsyncDns, ""}
+};
+
 
 // RECORDING USER METRICS FOR FLAGS:
 // -----------------------------------------------------------------------------
@@ -521,7 +529,7 @@ const Experiment kExperiments[] = {
     IDS_FLAGS_ENABLE_ASYNC_DNS_NAME,
     IDS_FLAGS_ENABLE_ASYNC_DNS_DESCRIPTION,
     kOsWin | kOsMac | kOsLinux | kOsCrOS,

[cbentzel, 2012/08/20 11:45:56]

Should you remove kOsCros at this point? I thought there were still issues with
DNS config?

[szym, 2012/08/20 17:54:21]

There are, but I'm currently working on the merger of DnsConfigService into
NetworkChangeNotifier which will re-enable it for CrOS. I could disable it for
now if you prefer.

[cbentzel, 2012/08/21 10:50:53]

Yeah, disable for now especially since this change will opt users in.

-    SINGLE_VALUE_TYPE(switches::kEnableAsyncDns)
+    MULTI_VALUE_TYPE(kAsyncDnsChoices)
   },
   {
     "enable-video-track",