Blink-side contiguous allocation of display items.

Source/platform/graphics/paint/CompositingDisplayItem.h

Index: Source/platform/graphics/paint/CompositingDisplayItem.h
diff --git a/Source/platform/graphics/paint/CompositingDisplayItem.h b/Source/platform/graphics/paint/CompositingDisplayItem.h
index 251ff30a6707922bf38fd31288cfaab83ae5a5b8..97ce09809645f866053b6343360fca0c8dbc95ce 100644
--- a/Source/platform/graphics/paint/CompositingDisplayItem.h
+++ b/Source/platform/graphics/paint/CompositingDisplayItem.h
@@ -17,23 +17,17 @@
 namespace blink {
 
 class PLATFORM_EXPORT BeginCompositingDisplayItem : public PairedBeginDisplayItem {
-    WTF_MAKE_FAST_ALLOCATED(BeginCompositingDisplayItem);
 public:
-    static PassOwnPtr<BeginCompositingDisplayItem> create(const DisplayItemClientWrapper& client, const SkXfermode::Mode xferMode, const float opacity, const FloatRect* bounds = nullptr, ColorFilter colorFilter = ColorFilterNone)
-    {
-        return adoptPtr(new BeginCompositingDisplayItem(client, xferMode, opacity, bounds, colorFilter));
-    }
-
     BeginCompositingDisplayItem(const DisplayItemClientWrapper& client, const SkXfermode::Mode xferMode, const float opacity, const FloatRect* bounds, ColorFilter colorFilter = ColorFilterNone)
         : PairedBeginDisplayItem(client, BeginCompositing)
         , m_xferMode(xferMode)
         , m_opacity(opacity)
         , m_hasBounds(bounds)
         , m_colorFilter(colorFilter)
-        {
-            if (bounds)
-                m_bounds = FloatRect(*bounds);
-        }
+    {
+        if (bounds)
+            m_bounds = FloatRect(*bounds);
+    }
 
     virtual void replay(GraphicsContext&) override;
     virtual void appendToWebDisplayItemList(WebDisplayItemList*) const override;
@@ -50,13 +44,7 @@ private:
 };
 
 class PLATFORM_EXPORT EndCompositingDisplayItem : public PairedEndDisplayItem {
-    WTF_MAKE_FAST_ALLOCATED(EndCompositingDisplayItem);
 public:
-    static PassOwnPtr<EndCompositingDisplayItem> create(const DisplayItemClientWrapper& client)
-    {
-        return adoptPtr(new EndCompositingDisplayItem(client));
-    }
-
     EndCompositingDisplayItem(const DisplayItemClientWrapper& client)
         : PairedEndDisplayItem(client, EndCompositing) { }