compositor-worker: Introduce CompositorProxy::disconnect().

Source/core/dom/Element.cpp

Index: Source/core/dom/Element.cpp
diff --git a/Source/core/dom/Element.cpp b/Source/core/dom/Element.cpp
index 71191c2d41e13f567b68072831047999af2ca051..f6e4dda538c64b121e6ec7c0e55b5b2aae0dd389 100644
--- a/Source/core/dom/Element.cpp
+++ b/Source/core/dom/Element.cpp
@@ -949,6 +949,16 @@ void Element::scrollFrameTo(const ScrollToOptions& scrollToOptions)
     view->setScrollPosition(DoublePoint(scaledLeft, scaledTop), scrollBehavior);
 }
 
+void Element::incrementProxyCount()
+{
+    ensureElementRareData().incrementProxyCount();
+}
+
+void Element::decrementProxyCount()
+{
+    ensureElementRareData().decrementProxyCount();
+}
+
 IntRect Element::boundsInViewportSpace()
 {
     document().updateLayoutIgnorePendingStylesheets();