Track how often we successfully resolve non-'compliant' domain names.

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index d49de6ca46708540be8ead92b5e64157f34035de..23d3f0644c52d11700f3a42fca103c7424c3cd59 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -40549,6 +40549,16 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Net.SuccessfulResolutionWithValidDNSName" enum="Boolean">
+  <owner>palmer@chromium.org</owner>
+  <summary>
+    True if a DNS name contains only characters for which
+    |net::IsValidLabelCharacter| returns true. Used to see if we can deprecate
+    and remove support for arbitrary bytes in DNS names. This histogram is
+    recorded after DNS resolution has completed successfully.
+  </summary>
+</histogram>
+
 <histogram name="Net.TCP_Connection_Idle_Sockets">
   <obsolete>
     Deprecated 04/2016 as doesn't have data nor owner.
@@ -76339,8 +76349,8 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <owner>treib@chromium.org</owner>
   <summary>
     The time for the new tab page to fire the &quot;load&quot; event. Note: This
-    is usually recorded with a suffix (.Local/Google/Other). The base version
-    is recorded only on Android. Recorded only once per tab, i.e. excluding
+    is usually recorded with a suffix (.Local/Google/Other). The base version is
+    recorded only on Android. Recorded only once per tab, i.e. excluding
     back/forward navigations.
   </summary>
 </histogram>