Migrate touch events to EventHandlerRegistry

Source/core/frame/EventHandlerRegistry.h

Index: Source/core/frame/EventHandlerRegistry.h
diff --git a/Source/core/frame/EventHandlerRegistry.h b/Source/core/frame/EventHandlerRegistry.h
index 4d53b31def180c6fed91c02efc44180e9cdc9ce1..71bd87fb3de91444b6eeff505820847f6ef7f9c2 100644
--- a/Source/core/frame/EventHandlerRegistry.h
+++ b/Source/core/frame/EventHandlerRegistry.h
@@ -26,6 +26,7 @@ public:
     enum EventHandlerClass {
         ScrollEvent,
         WheelEvent,
+        TouchEvent,
 #if ASSERT_ENABLED
         // Additional event categories for verifying handler tracking logic.
         EventsForTesting,
@@ -45,10 +46,10 @@ public:
     void didRemoveEventHandler(EventTarget&, const AtomicString& eventType);
     void didRemoveEventHandler(EventTarget&, EventHandlerClass);
     void didRemoveAllEventHandlers(EventTarget&);
-    void didMoveIntoFrameHost(EventTarget&);
-    void didMoveOutOfFrameHost(EventTarget&);
 
-    // Either |documentDetached| or |didMoveOutOfFrameHost| must be called
+    static void didMoveBetweenFrameHosts(EventTarget&, FrameHost* oldFrameHost, FrameHost* newFrameHost);
+
+    // Either |documentDetached| or |didMoveBetweenFrameHosts| must be called
     // whenever the FrameHost that is associated with a registered event target
     // changes. This ensures the registry does not end up with stale references
     // to handlers that are no longer related to it.
@@ -77,6 +78,11 @@ private:
     // between the two cases.
     void notifyHasHandlersChanged(EventHandlerClass, bool hasActiveHandlers);
 
+    // Called to notify clients whenever a single event handler target is
+    // registered or unregistered. If several handlers are registered for the
+    // same target, only the first registration will trigger this notification.
+    void notifyDidAddOrRemoveEventHandlerTarget(EventHandlerClass);
+
     // Record a change operation to a given event handler class and notify any
     // parent registry and other clients accordingly.
     void updateEventHandlerOfType(ChangeOperation, const AtomicString& eventType, EventTarget*);