Revert 138209

Source/WebCore/dom/Document.cpp

Index: Source/WebCore/dom/Document.cpp
===================================================================
--- Source/WebCore/dom/Document.cpp	(revision 138265)
+++ Source/WebCore/dom/Document.cpp	(working copy)
@@ -498,9 +498,6 @@
     , m_writeRecursionIsTooDeep(false)
     , m_writeRecursionDepth(0)
     , m_wheelEventHandlerCount(0)
-#if ENABLE(TOUCH_EVENTS)
-    , m_touchEventHandlerCount(0)
-#endif
     , m_pendingTasksTimer(this, &Document::pendingTasksTimerFired)
     , m_scheduledTasksAreSuspended(false)
     , m_visualUpdatesAllowed(true)
@@ -613,6 +610,10 @@
     ASSERT(!m_parentTreeScope);
     ASSERT(!m_guardRefCount);
 
+#if ENABLE(TOUCH_EVENT_TRACKING)
+    if (Document* ownerDocument = this->ownerDocument())
+        ownerDocument->didRemoveEventTargetNode(this);
+#endif
     // FIXME: Should we reset m_domWindow when we detach from the Frame?
     if (m_domWindow)
         m_domWindow->resetUnlessSuspendedForPageCache();
@@ -5599,36 +5600,68 @@
     wheelEventHandlerCountChanged(this);
 }
 
-void Document::didAddTouchEventHandler()
+void Document::didAddTouchEventHandler(Node* handler)
 {
 #if ENABLE(TOUCH_EVENTS)
-    ++m_touchEventHandlerCount;
-    if (m_touchEventHandlerCount > 1)
+    if (!m_touchEventTargets.get())
+        m_touchEventTargets = adoptPtr(new TouchEventTargetSet);
+    m_touchEventTargets->add(handler);
+    if (Document* parent = parentDocument()) {
+        parent->didAddTouchEventHandler(this);
         return;
-    if (Page* page = this->page())
-        page->chrome()->client()->needTouchEvents(true);
+    }
+    if (Page* page = this->page()) {
+#if ENABLE(TOUCH_EVENT_TRACKING)
+        if (ScrollingCoordinator* scrollingCoordinator = page->scrollingCoordinator())
+            scrollingCoordinator->touchEventTargetRectsDidChange(this);
 #endif
+        if (m_touchEventTargets->size() == 1)
+            page->chrome()->client()->needTouchEvents(true);
+    }
+#else
+    UNUSED_PARAM(handler);
+#endif
 }
 
-void Document::didRemoveTouchEventHandler()
+void Document::didRemoveTouchEventHandler(Node* handler)
 {
 #if ENABLE(TOUCH_EVENTS)
-    ASSERT(m_touchEventHandlerCount);
-    --m_touchEventHandlerCount;
-    if (m_touchEventHandlerCount)
+    if (!m_touchEventTargets.get())
         return;
+    ASSERT(m_touchEventTargets->contains(handler));
+    m_touchEventTargets->remove(handler);
+    if (Document* parent = parentDocument()) {
+        parent->didRemoveTouchEventHandler(this);
+        return;
+    }
 
     Page* page = this->page();
     if (!page)
         return;
+#if ENABLE(TOUCH_EVENT_TRACKING)
+    if (ScrollingCoordinator* scrollingCoordinator = page->scrollingCoordinator())
+        scrollingCoordinator->touchEventTargetRectsDidChange(this);
+#endif
+    if (m_touchEventTargets->size())
+        return;
     for (const Frame* frame = page->mainFrame(); frame; frame = frame->tree()->traverseNext()) {
-        if (frame->document() && frame->document()->touchEventHandlerCount())
+        if (frame->document() && frame->document()->hasTouchEventHandlers())
             return;
     }
     page->chrome()->client()->needTouchEvents(false);
+#else
+    UNUSED_PARAM(handler);
 #endif
 }
 
+#if ENABLE(TOUCH_EVENT_TRACKING)
+void Document::didRemoveEventTargetNode(Node* handler)
+{
+    if (m_touchEventTargets.get())
+        m_touchEventTargets->removeAll(handler);
+}
+#endif
+
 HTMLIFrameElement* Document::seamlessParentIFrame() const
 {
     if (!shouldDisplaySeamlesslyWithParent())