[Offline pages] Adding metrics for OIB's Open online button

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 20188277cf1f33b36f16434b5d7f8a9c89a3007a..7d27973a53e338d2b00f4c7990214456c6916903 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -39910,6 +39910,27 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram
+    name="OfflinePages.WebsiteSettings.ConnectedWhenOpenOnlineButtonClicked"
+    enum="BooleanConnected">
+  <owner>fgorski@chromium.org</owner>
+  <summary>
+    Indicates whether the browser was connected when Open online button was
+    clicked on Website Settings popup, which causes a reload of an offline page
+    to online version.
+  </summary>
+</histogram>
+
+<histogram name="OfflinePages.WebsiteSettings.OpenOnlineButtonVisible"
+    enum="BooleanVisible">
+  <owner>fgorski@chromium.org</owner>
+  <summary>
+    Indicates whether Open online was visible in Website Settings popup, when it
+    was shown for an offline page. (The button is visible only when Chrome is
+    connected when the Website Settings popup is opened for offline page.)
+  </summary>
+</histogram>
+
 <histogram name="OfflinePolicy.SuccessfulResourceLoadPercentage" units="%">
   <obsolete>
     Deprecated 04/2016 as doesn't have data nor owner.