Add UMA metric for tracking root level listeners for blocking touch.

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 db3a473bcae61c788f3cb554cd4ec8110b6d2468..30f8f64e96a45aa82ef81a30032f90f931c08af8 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -12392,6 +12392,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 
 <histogram name="Event.Touch.TargetAndDispatchResult"
     enum="TouchTargetAndDispatchResultType">
+  <obsolete>
+    Deprecated 05/2016, and replaced by Event.Touch.TargetAndDispatchResult2.
+  </obsolete>
   <owner>dtapuska@chromium.org</owner>
   <summary>
     An enumeration identifying 3 properties: 1) a classification of the event
@@ -12401,6 +12404,21 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Event.Touch.TargetAndDispatchResult2"
+    enum="TouchTargetAndDispatchResultType2">
+  <owner>dtapuska@chromium.org</owner>
+  <summary>
+    An enumeration identifying 4 properties: 1) a classification of the current
+    target whether it is a root scroll listener (window, document, body) or not;
+    2) the result of the dispatch or whether it was previously canceled 3)
+    whether the document was scrollable or not 4) what phase the listener was
+    encountered at. This metric is logged during the dispatch of the touch
+    events. It will only be reported for main frame events that block scrolling,
+    have only one touch point and current targets that fired an event listener
+    at that phase.
+  </summary>
+</histogram>
+
 <histogram name="Event.Touch.TimedOutOnDesktopSite" enum="BooleanTimedOut">
   <owner>rbyers@chromium.org</owner>
   <summary>
@@ -88599,6 +88617,89 @@ To add a new entry, add it with any value and run test to compute valid value.
       label="Root-scroller, scrollable document, handled application"/>
 </enum>
 
+<enum name="TouchTargetAndDispatchResultType2" type="int">
+  <int value="0"
+      label="Capturing Non-root-scroller, non-scrollable document, already
+             handled"/>
+  <int value="1"
+      label="Capturing Non-root-scroller, non-scrollable document, not
+             handled"/>
+  <int value="2"
+      label="Capturing Non-root-scroller, non-scrollable document, handled
+             application"/>
+  <int value="3"
+      label="Capturing Non-root-scroller, scrollable document, already
+             handled"/>
+  <int value="4"
+      label="Capturing Non-root-scroller, scrollable document, not handled"/>
+  <int value="5"
+      label="Capturing Non-root-scroller, scrollable document, handled
+             application"/>
+  <int value="6"
+      label="Capturing Root-scroller, non-scrollable document, already
+             handled"/>
+  <int value="7"
+      label="Capturing Root-scroller, non-scrollable document, not handled"/>
+  <int value="8"
+      label="Capturing Root-scroller, non-scrollable document, handled
+             application"/>
+  <int value="9"
+      label="Capturing Root-scroller, scrollable document, already handled"/>
+  <int value="10"
+      label="Capturing Root-scroller, scrollable document, not handled"/>
+  <int value="11"
+      label="Capturing Root-scroller, scrollable document, handled
+             application"/>
+  <int value="12"
+      label="Non-root-scroller, non-scrollable document, already handled"/>
+  <int value="13"
+      label="Non-root-scroller, non-scrollable document, not handled"/>
+  <int value="14"
+      label="Non-root-scroller, non-scrollable document, handled application"/>
+  <int value="15"
+      label="Non-root-scroller, scrollable document, already handled"/>
+  <int value="16" label="Non-root-scroller, scrollable document, not handled"/>
+  <int value="17"
+      label="Non-root-scroller, scrollable document, handled application"/>
+  <int value="18"
+      label="Root-scroller, non-scrollable document, already handled"/>
+  <int value="19" label="Root-scroller, non-scrollable document, not handled"/>
+  <int value="20"
+      label="Root-scroller, non-scrollable document, handled application"/>
+  <int value="21" label="Root-scroller, scrollable document, already handled"/>
+  <int value="22" label="Root-scroller, scrollable document, not handled"/>
+  <int value="23"
+      label="Root-scroller, scrollable document, handled application"/>
+  <int value="24"
+      label="Bubbling Non-root-scroller, non-scrollable document, already
+             handled"/>
+  <int value="25"
+      label="Bubbling Non-root-scroller, non-scrollable document, not handled"/>
+  <int value="26"
+      label="Bubbling Non-root-scroller, non-scrollable document, handled
+             application"/>
+  <int value="27"
+      label="Bubbling Non-root-scroller, scrollable document, already handled"/>
+  <int value="28"
+      label="Bubbling Non-root-scroller, scrollable document, not handled"/>
+  <int value="29"
+      label="Bubbling Non-root-scroller, scrollable document, handled
+             application"/>
+  <int value="30"
+      label="Bubbling Root-scroller, non-scrollable document, already handled"/>
+  <int value="31"
+      label="Bubbling Root-scroller, non-scrollable document, not handled"/>
+  <int value="32"
+      label="Bubbling Root-scroller, non-scrollable document, handled
+             application"/>
+  <int value="33"
+      label="Bubbling Root-scroller, scrollable document, already handled"/>
+  <int value="34"
+      label="Bubbling Root-scroller, scrollable document, not handled"/>
+  <int value="35"
+      label="Bubbling Root-scroller, scrollable document, handled application"/>
+</enum>
+
 <enum name="TPMResultCodeEnum" type="int">
   <int value="0" label="TPM_SUCCESS"/>
   <int value="1" label="TPM_E_AUTHFAIL"/>