Hook up Reader Mode InfoBar

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 7400ff4b9423df282aba7d8ddb4f26d2b7c6b71b..f3441b36d82c81bc48acbcffed2bdd1a868b0a02 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -13282,6 +13282,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="DomDistiller.BarCloseButtonUsage" enum="BooleanPanelWasOpen">
+  <obsolete>
+    UI rewrite to be an InfoBar makes this metric irrelevant as of 05/2017.
+  </obsolete>
   <owner>mdjones@chromium.org</owner>
   <summary>
     Records if the close button was used before or after opening and viewing
@@ -13319,6 +13322,11 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="DomDistiller.InfoBarUsage" enum="BooleanUsage">
+  <owner>mdjones@chromium.org</owner>
+  <summary>Records if the infobar was used or closed.</summary>
+</histogram>
+
 <histogram name="DomDistiller.LongArticleScoreNMF.Negative" units="score">
   <owner>wychen@chromium.org</owner>
   <summary>
@@ -13459,6 +13467,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="DomDistiller.Time.SwipeToPaint" units="ms">
+  <obsolete>
+    UI rewrite to be an InfoBar makes this metric irrelevant as of 05/2017.
+  </obsolete>
   <owner>wychen@chromium.org</owner>
   <summary>
     Records the time from a swipe-up gesture on ReaderModePanel to the first