cc: Use a ListContainer for DisplayItemList to reduce allocations.

cc/resources/compositing_display_item.h

Index: cc/resources/compositing_display_item.h
diff --git a/cc/resources/compositing_display_item.h b/cc/resources/compositing_display_item.h
index 992403f3120a4e8911002a46c04777b0b34226ec..8dcf0aebbe07e1578d883066640ab842325b705a 100644
--- a/cc/resources/compositing_display_item.h
+++ b/cc/resources/compositing_display_item.h
@@ -21,16 +21,13 @@ namespace cc {
 
 class CC_EXPORT CompositingDisplayItem : public DisplayItem {
  public:
+  CompositingDisplayItem();
   ~CompositingDisplayItem() override;
 
-  static scoped_ptr<CompositingDisplayItem> Create(
-      uint8_t alpha,
-      SkXfermode::Mode xfermode,
-      SkRect* bounds,
-      skia::RefPtr<SkColorFilter> color_filter) {
-    return make_scoped_ptr(
-        new CompositingDisplayItem(alpha, xfermode, bounds, color_filter));
-  }
+  void SetNew(uint8_t alpha,
+              SkXfermode::Mode xfermode,
+              SkRect* bounds,
+              skia::RefPtr<SkColorFilter> color_filter);
 
   void Raster(SkCanvas* canvas, SkDrawPictureCallback* callback) const override;
 
@@ -55,6 +52,7 @@ class CC_EXPORT CompositingDisplayItem : public DisplayItem {
 
 class CC_EXPORT EndCompositingDisplayItem : public DisplayItem {
  public:
+  EndCompositingDisplayItem();
   ~EndCompositingDisplayItem() override;
 
   static scoped_ptr<EndCompositingDisplayItem> Create() {
@@ -67,9 +65,6 @@ class CC_EXPORT EndCompositingDisplayItem : public DisplayItem {
   int ApproximateOpCount() const override;
   size_t PictureMemoryUsage() const override;
   void AsValueInto(base::trace_event::TracedValue* array) const override;
-
- protected:
-  EndCompositingDisplayItem();
 };
 
 }  // namespace cc