Transmit a X-Chrome-UMA-Enabled bit to Google domains from clients that have UMA enabled.

chrome/browser/profiles/profile_io_data.cc

Index: chrome/browser/profiles/profile_io_data.cc
diff --git a/chrome/browser/profiles/profile_io_data.cc b/chrome/browser/profiles/profile_io_data.cc
index f1451544737f6d4dfc4d05aa1e665fade4a6f288..84910bb348ce521b63b79d4358497ce7f4d58d83 100644
--- a/chrome/browser/profiles/profile_io_data.cc
+++ b/chrome/browser/profiles/profile_io_data.cc
@@ -439,7 +439,10 @@ void ProfileIOData::LazyInitialize() const {
         url_blacklist_manager_.get(),
         profile_params_->profile,
         profile_params_->cookie_settings,
-        &enable_referrers_));
+        profile_params_->is_incognito ? ChromeNetworkDelegate::INCOGNITO :
+                                        ChromeNetworkDelegate::NORMAL,
+        &enable_referrers_,
+        &enable_metrics_));
 
   fraudulent_certificate_reporter_.reset(
       new chrome_browser_net::ChromeFraudulentCertificateReporter(
@@ -518,6 +521,7 @@ void ProfileIOData::ApplyProfileParamsToContext(
 void ProfileIOData::ShutdownOnUIThread() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   enable_referrers_.Destroy();
+  enable_metrics_.Destroy();
   clear_local_state_on_exit_.Destroy();
   safe_browsing_enabled_.Destroy();
   session_startup_pref_.Destroy();