Collect data on site engagement vs dialogs.

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 30cd03f55469e4aae9bbbb9efe85a856131ac662..d3fa105649fca7b1d55f644f03af5cc74c3b1851 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -20638,6 +20638,47 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="JSDialogs.CountOfCharactersKarmaHigher">
+  <owner>avi@chromium.org</owner>
+  <summary>
+    The count of the number of characters in JavaScript dialog messages shown by
+    a page that has a site engagement score of higher than 5.
+  </summary>
+</histogram>
+
+<histogram name="JSDialogs.CountOfCharactersKarmaLessThanOne">
+  <owner>avi@chromium.org</owner>
+  <summary>
+    The count of the number of characters in JavaScript dialog messages shown by
+    a page that has a site engagement score of less than 1.
+  </summary>
+</histogram>
+
+<histogram name="JSDialogs.CountOfCharactersKarmaNone">
+  <owner>avi@chromium.org</owner>
+  <summary>
+    The count of the number of characters in JavaScript dialog messages shown by
+    a page that has a site engagement score of 0.
+  </summary>
+</histogram>
+
+<histogram name="JSDialogs.CountOfCharactersKarmaOneToFive">
+  <owner>avi@chromium.org</owner>
+  <summary>
+    The count of the number of characters in JavaScript dialog messages shown by
+    a page that has a site engagement score between 1 and less than 5.
+  </summary>
+</histogram>
+
+<histogram name="JSDialogs.CountOfCharactersUserSuppressed">
+  <owner>avi@chromium.org</owner>
+  <summary>
+    The count of the number of characters in JavaScript dialog messages that
+    were suppressed by the user. Compare with
+    JSDialogs.CountOfJSDialogMessageCharacters.
+  </summary>
+</histogram>
+
 <histogram name="JSDialogs.CountOfJSDialogMessageCharacters">
   <owner>avi@chromium.org</owner>
   <summary>
@@ -20712,6 +20753,11 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="JSDialogs.SiteKarmaOfDialogs">
+  <owner>avi@chromium.org</owner>
+  <summary>The site engagement values of sites showing dialogs.</summary>
+</histogram>
+
 <histogram name="Keyboard.KeystrokeDeltas" units="ms">
   <obsolete>
     Deprecated 07/2016 in crbug.com/631204 with KeyboardUmaEventFilter removal.