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

chrome/browser/search_engines/template_url_prepopulate_data.cc

Index: chrome/browser/search_engines/template_url_prepopulate_data.cc
diff --git a/chrome/browser/search_engines/template_url_prepopulate_data.cc b/chrome/browser/search_engines/template_url_prepopulate_data.cc
index 7cd25c3ccc81d8bac90780ebeb76c080e735aa43..64101db0edee907515ee02aa6c2614ad57edfd29 100644
--- a/chrome/browser/search_engines/template_url_prepopulate_data.cc
+++ b/chrome/browser/search_engines/template_url_prepopulate_data.cc
@@ -3284,7 +3284,8 @@ static const PrepopulatedEngine* GetEngineForURL(const std::string& url) {
   // First special-case Google, because the prepopulate URL for it will not
   // convert to a GURL and thus won't have an origin.  Instead see if the
   // incoming URL's host is "[*.]google.<TLD>".
-  if (google_util::IsGoogleHostname(as_gurl.host()))
+  if (google_util::IsGoogleHostname(as_gurl.host(),
+                                    google_util::DISALLOW_SUBDOMAIN))
     return &google;
 
   // Now check the rest of the prepopulate data.