cc: Use a ListContainer for DisplayItemList to reduce allocations.

cc/resources/drawing_display_item.h

Index: cc/resources/drawing_display_item.h
diff --git a/cc/resources/drawing_display_item.h b/cc/resources/drawing_display_item.h
index da302d87d9c82096443b1eef9470693ea86faf1d..be9dbc33ab435e138a57bbe677a013540fc2547b 100644
--- a/cc/resources/drawing_display_item.h
+++ b/cc/resources/drawing_display_item.h
@@ -19,12 +19,10 @@ namespace cc {
 
 class CC_EXPORT DrawingDisplayItem : public DisplayItem {
  public:
+  DrawingDisplayItem();
   ~DrawingDisplayItem() override;
 
-  static scoped_ptr<DrawingDisplayItem> Create(
-      skia::RefPtr<SkPicture> picture) {
-    return make_scoped_ptr(new DrawingDisplayItem(picture));
-  }
+  void SetNew(skia::RefPtr<SkPicture> picture);
 
   void Raster(SkCanvas* canvas, SkDrawPictureCallback* callback) const override;
 
@@ -33,7 +31,7 @@ class CC_EXPORT DrawingDisplayItem : public DisplayItem {
   size_t PictureMemoryUsage() const override;
   void AsValueInto(base::trace_event::TracedValue* array) const override;
 
-  scoped_ptr<DrawingDisplayItem> Clone();
+  void CloneTo(DrawingDisplayItem* item) const;
 
  protected:
   explicit DrawingDisplayItem(skia::RefPtr<SkPicture> picture);