Persist broken and recently-broken alt-svcs to prefs in HttpServerPropertiesManager

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 d1a99e83386f5c53227ce18ecb729103ccc3b646..0aeffd384cf8ec453ce684f586b07d5a2efde9af 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -35480,6 +35480,14 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Net.CountOfBrokenAlternativeServices" units="services">
+  <owner>wangyix@chromium.org</owner>
+  <summary>
+    This counts the number of broken alternative services persisted to prefs
+    file.
+  </summary>
+</histogram>
+
 <histogram name="Net.CountOfPipelineCapableServers" units="servers">
   <obsolete>
     Deprecated 05/2014, related field trial already long expired.
@@ -35498,6 +35506,14 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Net.CountOfRecentlyBrokenAlternativeServices" units="services">
+  <owner>wangyix@chromium.org</owner>
+  <summary>
+    This counts the number of recently broken alternative services persisted to
+    prefs file.
+  </summary>
+</histogram>
+
 <histogram name="Net.CountOfSpdyServers">
   <owner>bnc@chromium.org</owner>
   <owner>rch@chromium.org</owner>