Collect more UMA data about dialogs and site engagement.

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 1727ca2af1de172d509f753c4c577ae0f75a421b..3dd60034af41205b1509fccac75b363fb63785dc 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -102213,6 +102213,13 @@ To add a new entry, add it with any value and run test to compute valid value.
   <affected-histogram name="DNS.PrefetchResolution"/>
 </histogram_suffixes>
 
+<histogram_suffixes name="JSDialogs.DialogType" separator=".">
+  <suffix name="Alert"/>
+  <suffix name="Confirm"/>
+  <suffix name="Prompt"/>
+  <affected-histogram name="JSDialogs.SiteEngagementOfDialogs"/>
+</histogram_suffixes>
+
 <histogram_suffixes name="JSDialogs.EngagementList" separator=".">
   <suffix name="EngagementNone" label="site engagement = 0"/>
   <suffix name="EngagementLessThanOne" label="site engagement &lt; 1"/>
@@ -102221,6 +102228,24 @@ To add a new entry, add it with any value and run test to compute valid value.
   <affected-histogram name="JSDialogs.CharacterCount"/>
 </histogram_suffixes>
 
+<histogram_suffixes name="JSDialogs.FrameType" separator=".">
+  <suffix name="MainFrame" label="dialog spawned by the main frame"/>
+  <suffix name="Subframe" label="dialog spawned by a subframe"/>
+  <affected-histogram name="JSDialogs.CharacterCount"/>
+</histogram_suffixes>
+
+<histogram_suffixes name="JSDialogs.LeaveStay" separator=".">
+  <suffix name="Leave" label="user opted to leave the page"/>
+  <suffix name="Stay" label="user opted to stay on the page"/>
+  <affected-histogram name="JSDialogs.SiteEngagementOfBeforeUnload"/>
+</histogram_suffixes>
+
+<histogram_suffixes name="JSDialogs.UserGestureSinceLoad" separator=".">
+  <suffix name="UserGestureSinceLoad"/>
+  <suffix name="NoUserGestureSinceLoad"/>
+  <affected-histogram name="JSDialogs.CharacterCount"/>
+</histogram_suffixes>
+
 <histogram_suffixes name="LateBindingExperiment">
   <suffix name="disable_late_binding" label="socket late binding is disabled"/>
   <suffix name="enable_late_binding" label="socket late binding is enabled"/>