Migrate wheel events to EventHandlerRegistry

Source/core/frame/EventHandlerRegistry.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/frame/EventHandlerRegistry.h"
 
 #include "core/events/ThreadLocalEventNames.h"
 #include "core/frame/DOMWindow.h"
 #include "core/frame/LocalFrame.h"
@@ skipping 10 matching lines @@
 
 EventHandlerRegistry::~EventHandlerRegistry()
 {
     checkConsistency();
 }
 
 bool EventHandlerRegistry::eventTypeToClass(const AtomicString& eventType, EventHandlerClass* result)
 {
     if (eventType == EventTypeNames::scroll) {
         *result = ScrollEvent;
+    } else if (eventType == EventTypeNames::wheel || eventType == EventTypeNames::mousewheel) {
+        *result = WheelEvent;
 #if ASSERT_ENABLED
     } else if (eventType == EventTypeNames::load || eventType == EventTypeNames::mousemove || eventType == EventTypeNames::touchstart) {
         *result = EventsForTesting;
 #endif
     } else {
         return false;
     }
     return true;
 }
 
@@ skipping 107 matching lines @@
             continue;
         }
         for (unsigned count = target.getEventListeners(eventTypes[i]).size(); count > 0; --count)
             updateEventHandlerInternal(op, handlerClass, &target);
     }
 }
 
 void EventHandlerRegistry::notifyHasHandlersChanged(EventHandlerClass handlerClass, bool hasActiveHandlers)
 {
     ScrollingCoordinator* scrollingCoordinator = m_frameHost.page().scrollingCoordinator();
+    LocalFrame* mainFrame = m_frameHost.page().mainFrame();
 
     switch (handlerClass) {
     case ScrollEvent:
         if (scrollingCoordinator)
             scrollingCoordinator->updateHaveScrollEventHandlers();
         break;
+    case WheelEvent:
+        if (mainFrame) {
+            // FIXME: This notification is wired up to a black hole, so remove it.
+            mainFrame->notifyChromeClientWheelEventHandlerCountChanged();
+        }
+        if (scrollingCoordinator)
+            scrollingCoordinator->updateHaveWheelEventHandlers();
+        break;
 #if ASSERT_ENABLED
     case EventsForTesting:
         break;
 #endif
     default:
         ASSERT_NOT_REACHED();
         break;
     }
 }
 
@@ skipping 66 matching lines @@
                 ASSERT(window->frame());
                 ASSERT(window->frame()->host());
                 ASSERT(window->frame()->host() == &m_frameHost);
             }
         }
     }
 #endif // ASSERT_ENABLED
 }
 
 } // namespace WebCore