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 ddc60ffeb08aa0a7ef868443448456e2898c7353..2192852d45514061db3223555e73b3564c1ee773 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -101240,20 +101240,24 @@ To add a new entry, add it with any value and run test to compute valid value.
   <suffix name="Clients.DataReductionProxy"
       label="PageLoadMetrics that are a result of a navigation through the
              data reduction proxy."/>
   <suffix name="Clients.DataReductionProxy.LoFiOn"
       label="PageLoadMetrics that are a result of a navigation through the
              data reduction proxy with session in LoFi enabled or control
              field trial, and when the connection was slow."/>
   <suffix name="Clients.DocWrite.Evaluator"
       label="PageLoadMetrics from a page that could have been evaluated by
              the DocumentWriteEvaluator"/>
+  <suffix name="Clients.Previews.OfflinePages"
+      label="PageLoadMetrics that are a result of a navigation that shows
+             users an offline page preview. Offline page previews are shown
+             when a user's effective connection type is prohibitively slow."/>
   <suffix name="Clients.ServiceWorker"
       label="PageLoadMetrics from a page that is controlled by a Service
              Worker"/>
   <affected-histogram
       name="PageLoad.Timing2.DOMLoadingToDOMContentLoadedEventFired"/>
   <affected-histogram name="PageLoad.Timing2.DOMLoadingToFirstContentfulPaint"/>
   <suffix name="Clients.DocWrite.Block"
       label="PageLoadMetrics from a page that has synchronous, cross-origin
              document.written scripts that could be blocked if the
              document.write script blocking feature is enabled."/>