Make first TouchStart and first TouchMove events on a flinging layer non-blocking

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 86289108518b9ab3f4eecc463c38b22ca51a9914..1c864b13ba37c36a06062dd448a6dbea6a2f3079 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -13334,6 +13334,10 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 
 <histogram name="Event.PassiveListeners.ForcedNonBlockingLatency"
     units="microseconds">
+  <obsolete>
+    Deprecated 08/2016 in Issue 595327, and replaced by
+    Event.PassiveListeners.ForcedNonBlockingLatencyDueToFling.
+  </obsolete>
   <owner>dtapuska@chromium.org</owner>
   <summary>
     Time between when a forced non-blocking event was generated and the event
@@ -13342,6 +13346,17 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Event.PassiveListeners.ForcedNonBlockingLatencyDueToFling"
+    units="microseconds">
+  <owner>dtapuska@chromium.org</owner>
+  <summary>
+    Time between when a forced non-blocking touchstart or first touchmove event
+    per scroll was generated and the event processed during fling. This
+    histogram tracks the benefit of forcing non-blocking events listeners during
+    fling.
+  </summary>
+</histogram>
+
 <histogram name="Event.PassiveListeners.Latency" units="microseconds">
   <owner>dtapuska@chromium.org</owner>
   <summary>
@@ -13423,7 +13438,7 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
     enum="TouchEventDispatchResultType">
   <owner>tdresser@chromium.org</owner>
   <summary>
-    Records the disposition (handled or not handled) of touch start events and
+    Records the disposition (handled or not handled) of touchstart events and
     the first touchmove events per scroll. Only recorded after the page is fully
     loaded.
   </summary>
@@ -13433,7 +13448,7 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
     enum="TouchEventDispatchResultType">
   <owner>tdresser@chromium.org</owner>
   <summary>
-    Records the disposition (handled or not handled) of touch start events and
+    Records the disposition (handled or not handled) of touchstart events and
     the first touchmove events per scroll. Only recorded before the page is
     fully loaded.
   </summary>
@@ -13441,27 +13456,55 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 
 <histogram name="Event.Touch.TouchDispositionsDuringFling"
     enum="TouchEventDispatchResultType">
+  <obsolete>
+    Deprecated 08/2016 in Issue 595327, and replaced by
+    Event.Touch.TouchDispositionsDuringFling2.
+  </obsolete>
   <owner>tdresser@chromium.org</owner>
   <summary>
-    Records the disposition (handled or not handled) of touch start events. Only
+    Records the disposition (handled or not handled) of touchstart events. Only
     recorded while there is an active fling animation.
   </summary>
 </histogram>
 
+<histogram name="Event.Touch.TouchDispositionsDuringFling2"
+    enum="TouchEventDispatchResultType">
+  <owner>tdresser@chromium.org</owner>
+  <summary>
+    Records the disposition (handled or not handled) of touchstart and first
+    touchmove events per scroll. Only recorded while there is an active fling
+    animation.
+  </summary>
+</histogram>
+
 <histogram name="Event.Touch.TouchDispositionsOutsideFling"
     enum="TouchEventDispatchResultType">
+  <obsolete>
+    Deprecated 08/2016 in Issue 595327, and replaced by
+    Event.Touch.TouchDispositionsOutsideFling2.
+  </obsolete>
   <owner>tdresser@chromium.org</owner>
   <summary>
-    Records the disposition (handled or not handled) of touch start events. Only
+    Records the disposition (handled or not handled) of touchstart events. Only
     recorded while there is no active fling animation.
   </summary>
 </histogram>
 
+<histogram name="Event.Touch.TouchDispositionsOutsideFling2"
+    enum="TouchEventDispatchResultType">
+  <owner>tdresser@chromium.org</owner>
+  <summary>
+    Records the disposition (handled or not handled) of touchstart and first
+    touchmove events per scroll events. Only recorded while there is no active
+    fling animation.
+  </summary>
+</histogram>
+
 <histogram name="Event.Touch.TouchLatencyAfterPageLoad" units="microseconds">
   <owner>tdresser@chromium.org</owner>
   <summary>
     Time between when a touch event was generated and the event was processed.
-    Recorded only for touch start events and the first touchmove events per
+    Recorded only for touchstart events and the first touchmove events per
     scroll that occur after the page is fully loaded.
   </summary>
 </histogram>
@@ -13470,16 +13513,29 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   <owner>tdresser@chromium.org</owner>
   <summary>
     Time between when a touch event was generated and the event was processed.
-    Recorded only for touch start events and the first touchmove events per
+    Recorded only for touchstart events and the first touchmove events per
     scroll that occur before the page is fully loaded. This histogram tracks the
     benefit of forcing passive event listeners before the page is fully loaded.
   </summary>
 </histogram>
 
+<histogram name="Event.Touch.TouchLatencyOutsideFling" units="microseconds">
+  <owner>tdresser@chromium.org</owner>
+  <summary>
+    Time between when a touch event was generated and the event was processed.
+    Recorded only for touchstart events and the first touchmove events per
+    scroll when there was no active fling animation.
+  </summary>
+</histogram>
+
 <histogram name="Event.Touch.TouchStartLatencyDuringFling" units="microseconds">
+  <obsolete>
+    Deprecated 08/2016 in Issue 595327, and replaced by
+    Event.PassiveListeners.ForcedNonBlockingLatencyDueToFling.
+  </obsolete>
   <owner>tdresser@chromium.org</owner>
   <summary>
-    Time between when a touch start event was generated and the event was
+    Time between when a touchstart event was generated and the event was
     processed. Recorded only when there was an active fling animation. This
     histogram tracks the benefit of forcing passive event listeners during
     fling.
@@ -13488,9 +13544,13 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 
 <histogram name="Event.Touch.TouchStartLatencyOutsideFling"
     units="microseconds">
+  <obsolete>
+    Deprecated 08/2016 in Issue 595327, and replaced by
+    Event.Touch.TouchLatencyOutsideFling.
+  </obsolete>
   <owner>tdresser@chromium.org</owner>
   <summary>
-    Time between when a touch start event was generated and the event was
+    Time between when a touchstart event was generated and the event was
     processed. Recorded only when there was no active fling animation.
   </summary>
 </histogram>