Switch between online and offline version per network connection

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 ccf3c6ca1b2de1dd6d963123defe6ea2410e2622..d734e991d52531a05b0311138a00497336471744 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -31775,6 +31775,24 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <summary>Size of the saved copy of an offline page.</summary>
 </histogram>
 
+<histogram name="OfflinePages.RedirectToOfflineCount">

[rkaplow, 2016/02/26 22:08:45]

should add a unit

[jianli, 2016/02/26 23:02:41]

Done.

+  <owner>jianli@chromium.org</owner>
+  <summary>
+    Number of times an offline copy was loaded instead when the user is trying
+    to load the online version of a saved page and there is no network
+    connection.
+  </summary>
+</histogram>
+
+<histogram name="OfflinePages.RedirectToOnlineCount">
+  <owner>jianli@chromium.org</owner>
+  <summary>
+    Number of times an online version was loaded instead when the user is trying
+    to load the offline copy of a saved page and there is network connection.
+    connection.
+  </summary>
+</histogram>
+
 <histogram name="OfflinePages.SavedPageCount" units="pages">
   <owner>jianli@chromium.org</owner>
   <summary>