Migrate wheel events to EventHandlerRegistry

Source/web/WebViewImpl.cpp

 /*
  * Copyright (C) 2011, 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 21 matching lines @@
 #include "web/WebViewImpl.h"
 
 #include "CSSValueKeywords.h"
 #include "HTMLNames.h"
 #include "RuntimeEnabledFeatures.h"
 #include "core/accessibility/AXObjectCache.h"
 #include "core/clipboard/DataObject.h"
 #include "core/dom/Document.h"
 #include "core/dom/DocumentMarkerController.h"
 #include "core/dom/Text.h"
-#include "core/dom/WheelController.h"
 #include "core/editing/Editor.h"
 #include "core/editing/FrameSelection.h"
 #include "core/editing/InputMethodController.h"
 #include "core/editing/TextIterator.h"
 #include "core/events/KeyboardEvent.h"
 #include "core/events/WheelEvent.h"
+#include "core/frame/EventHandlerRegistry.h"
 #include "core/frame/FrameHost.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/PinchViewport.h"
 #include "core/frame/Settings.h"
 #include "core/frame/SmartClip.h"
 #include "core/html/HTMLInputElement.h"
 #include "core/html/HTMLMediaElement.h"
 #include "core/html/HTMLPlugInElement.h"
 #include "core/html/HTMLTextAreaElement.h"
@@ skipping 1410 matching lines @@
     if (!frame)
         return false;
 
     return frame->eventHandler().bubblingScroll(scrollDirection, scrollGranularity);
 }
 
 void WebViewImpl::popupOpened(PopupContainer* popupContainer)
 {
     ASSERT(!m_selectPopup);
     m_selectPopup = popupContainer;
-    ASSERT(mainFrameImpl()->frame()->document());
-    Document& document = *mainFrameImpl()->frame()->document();
-    WheelController::from(document)->didAddWheelEventHandler(document);
+    page()->frameHost().eventHandlerRegistry().didAddExternalEventHandler(EventTypeNames::wheel);

[Rick Byers, 2014/05/31 03:16:40]

I know you're just updating the existing code, but this seems fishy.  I wonder
why it's necessary.  Seems unfortunate to add the external event handler
mechanism just for this (but there was something else we needed it for right?). 
Anyway it's probably not necessary to dig into it now.

[Sami, 2014/06/02 10:00:22]

This is the only place where we need external event handlers :( Looks like this
is here to make sure popup windows are closed when you scroll:
https://chromiumcodereview.appspot.com/23677012. It feels like we should instead
close the popups as a response to a changing scroll offset -- but that could
have other side-effects.

 }
 
 void WebViewImpl::popupClosed(PopupContainer* popupContainer)
 {
     ASSERT(m_selectPopup);
     m_selectPopup = nullptr;
-    ASSERT(mainFrameImpl()->frame()->document());
-    Document& document = *mainFrameImpl()->frame()->document();
-    WheelController::from(document)->didRemoveWheelEventHandler(document);
+    page()->frameHost().eventHandlerRegistry().didRemoveExternalEventHandler(EventTypeNames::wheel);
 }
 
 PagePopup* WebViewImpl::openPagePopup(PagePopupClient* client, const IntRect& originBoundsInRootView)
 {
     ASSERT(client);
     if (hasOpenedPopup())
         hidePopups();
     ASSERT(!m_pagePopup);
 
     WebWidget* popupWidget = m_client->createPopupMenu(WebPopupTypePage);
@@ skipping 2573 matching lines @@
     const PageScaleConstraints& constraints = m_pageScaleConstraintsSet.pageDefinedConstraints();
 
     if (!mainFrameImpl() || !mainFrameImpl()->frameView())
         return false;
 
     return mainFrameImpl()->frameView()->layoutSize().width() == m_size.width
         || (constraints.minimumScale == constraints.maximumScale && constraints.minimumScale != -1);
 }
 
 } // namespace blink