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 4310cfe165c78c9c13aace0b45c6450f1fe80709..ff64eb19d089a470e4d20c8cc61a9afeda6ad8a1 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -13186,6 +13186,10 @@ 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 2233543002, 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
@@ -13194,6 +13198,17 @@ 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 touch start 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>
@@ -13293,6 +13308,10 @@ 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 2233543002, 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
@@ -13300,8 +13319,22 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Event.Touch.TouchDispositionsDuringFling2"
+    enum="TouchEventDispatchResultType">
+  <owner>tdresser@chromium.org</owner>
+  <summary>
+    Records the disposition (handled or not handled) of touch start and first
+    touch move 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 2233543002, 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
@@ -13309,6 +13342,16 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Event.Touch.TouchDispositionsOutsideFling2"
+    enum="TouchEventDispatchResultType">
+  <owner>tdresser@chromium.org</owner>
+  <summary>
+    Records the disposition (handled or not handled) of touch start and first
+    touch move 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>
@@ -13328,7 +13371,20 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </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 touch start 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 2233543002, 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
@@ -13340,6 +13396,10 @@ 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 2233543002, 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