https://bugs.webkit.org/show_bug.cgi?id=57997

<rdar://problem/9187856> REGRESSION(r75555): ~5-7 MB increase in memory between iBench runs
Navigating away from a Scrolled page which queues a scroll event that is never dispatched.
Cancel all enqueued events when detaching the Document the events cannot keep the Document
alive.

Reviewed by Darin Adler.

No change in functionality so no new tests.  

* dom/Document.cpp:
(WebCore::Document::detach):
* dom/EventQueue.cpp:
(WebCore::EventQueue::cancelQueuedEvents):
* dom/EventQueue.h:



git-svn-id: svn://svn.chromium.org/blink/trunk@83128 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/WebCore/ChangeLog

+2011-04-06  Stephanie Lewis  <slewis@apple.com>
+
+        Reviewed by Darin Adler.
+
+        https://bugs.webkit.org/show_bug.cgi?id=57997
+        <rdar://problem/9187856> REGRESSION(r75555): ~5-7 MB increase in memory between iBench runs
+        Navigating away from a Scrolled page which queues a scroll event that is never dispatched.
+        Cancel all enqueued events when detaching the Document the events cannot keep the Document
+        alive.
+
+        No change in functionality so no new tests.  
+
+        * dom/Document.cpp:
+        (WebCore::Document::detach):
+        * dom/EventQueue.cpp:
+        (WebCore::EventQueue::cancelQueuedEvents):
+        * dom/EventQueue.h:
+
 2011-04-06  Dan Bernstein  <mitz@apple.com>
 
         Reviewed by Darin Adler.

third_party/WebKit/Source/WebCore/dom/Document.cpp

@@ -1738,6 +1738,7 @@ void Document::detach()
 
     clearAXObjectCache();
     stopActiveDOMObjects();
+    m_eventQueue->cancelQueuedEvents();
 
 #if ENABLE(REQUEST_ANIMATION_FRAME)
     // FIXME: consider using ActiveDOMObject.

third_party/WebKit/Source/WebCore/dom/EventQueue.cpp

@@ -92,6 +92,12 @@ bool EventQueue::cancelEvent(Event* event)
     return found;
 }
 
+void EventQueue::cancelQueuedEvents()
+{
+    m_pendingEventTimer->stop();
+    m_queuedEvents.clear();
+}
+
 void EventQueue::pendingEventTimerFired()
 {
     ASSERT(!m_pendingEventTimer->isActive());

third_party/WebKit/Source/WebCore/dom/EventQueue.h

@@ -53,6 +53,7 @@ public:
     void enqueueEvent(PassRefPtr<Event>);
     void enqueueScrollEvent(PassRefPtr<Node>, ScrollEventTargetType);
     bool cancelEvent(Event*);
+    void cancelQueuedEvents();
 
 private:
     explicit EventQueue(ScriptExecutionContext*);