Blink-side contiguous allocation of display items.

Source/core/paint/FilterPainter.cpp

Index: Source/core/paint/FilterPainter.cpp
diff --git a/Source/core/paint/FilterPainter.cpp b/Source/core/paint/FilterPainter.cpp
index 3ef7321b7d501cab974dfcbe821b4e43aef8b0a6..2a6014281db9a95c13c17b17a9e007448cd4b729 100644
--- a/Source/core/paint/FilterPainter.cpp
+++ b/Source/core/paint/FilterPainter.cpp
@@ -63,14 +63,12 @@ FilterPainter::FilterPainter(DeprecatedPaintLayer& layer, GraphicsContext* conte
             FilterOperations filterOperations(layer.computeFilterOperations(m_layoutObject->styleRef()));
             OwnPtr<WebFilterOperations> webFilterOperations = adoptPtr(Platform::current()->compositorSupport()->createFilterOperations());
             builder.buildFilterOperations(filterOperations, webFilterOperations.get());
-            OwnPtr<BeginFilterDisplayItem> filterDisplayItem = BeginFilterDisplayItem::create(*m_layoutObject, imageFilter, rootRelativeBounds, webFilterOperations.release());
 
-            context->displayItemList()->add(filterDisplayItem.release());
+            context->displayItemList()->createAndAppendIfNeeded<BeginFilterDisplayItem>(*m_layoutObject, imageFilter, rootRelativeBounds, webFilterOperations.release());
         }
     } else {
-        OwnPtr<BeginFilterDisplayItem> filterDisplayItem = BeginFilterDisplayItem::create(*m_layoutObject, imageFilter, rootRelativeBounds);
-
-        filterDisplayItem->replay(*context);
+        BeginFilterDisplayItem filterDisplayItem(*m_layoutObject, imageFilter, rootRelativeBounds);
+        filterDisplayItem.replay(*context);
     }
 
     m_filterInProgress = true;
@@ -81,14 +79,13 @@ FilterPainter::~FilterPainter()
     if (!m_filterInProgress)
         return;
 
-    OwnPtr<EndFilterDisplayItem> endFilterDisplayItem = EndFilterDisplayItem::create(*m_layoutObject);
     if (RuntimeEnabledFeatures::slimmingPaintEnabled()) {
         ASSERT(m_context->displayItemList());
-        if (m_context->displayItemList()->displayItemConstructionIsDisabled())
-            return;
-        m_context->displayItemList()->add(endFilterDisplayItem.release());
+        if (!m_context->displayItemList()->displayItemConstructionIsDisabled())
+            m_context->displayItemList()->createAndAppendIfNeeded<EndFilterDisplayItem>(*m_layoutObject);
     } else {
-        endFilterDisplayItem->replay(*m_context);
+        EndFilterDisplayItem endFilterDisplayItem(*m_layoutObject);
+        endFilterDisplayItem.replay(*m_context);
     }
 }