Add use counter when touch-action isn't used when preventDefault'd.

third_party/WebKit/Source/core/events/Event.h

Index: third_party/WebKit/Source/core/events/Event.h
diff --git a/third_party/WebKit/Source/core/events/Event.h b/third_party/WebKit/Source/core/events/Event.h
index d1c8fdda5e04360673ffa91a61c2c4d3c0bfd0dc..e2074dd1a552b65efdc6b9c0d7419c24aae861ac 100644
--- a/third_party/WebKit/Source/core/events/Event.h
+++ b/third_party/WebKit/Source/core/events/Event.h
@@ -84,9 +84,17 @@ class CORE_EXPORT Event : public GarbageCollectedFinalized<Event>,
   };
 
   enum class PassiveMode {
+    // Not passive, default initialized.
+    NotPassiveDefault,
+    // Not passive, explicitly specified.
     NotPassive,
+    // Passive, explicitly specified.
     Passive,
+    // Passive, not explicitly specified and forced due to document level
+    // listener.
     PassiveForcedDocumentLevel,
+    // Passive, default initialized.
+    PassiveDefault,
   };
 
   static Event* create() { return new Event; }