cc: Use a ListContainer for DisplayItemList to reduce allocations.

cc/resources/compositing_display_item.cc

Index: cc/resources/compositing_display_item.cc
diff --git a/cc/resources/compositing_display_item.cc b/cc/resources/compositing_display_item.cc
index 15bd75cb380e9b42ec88b8143a162e9877247dcb..498ea0102131daf6d1de2eeaa185cb45b2d6f857 100644
--- a/cc/resources/compositing_display_item.cc
+++ b/cc/resources/compositing_display_item.cc
@@ -13,21 +13,24 @@
 
 namespace cc {
 
-CompositingDisplayItem::CompositingDisplayItem(uint8_t alpha,
-                                               SkXfermode::Mode xfermode,
-                                               SkRect* bounds,
-                                               skia::RefPtr<SkColorFilter> cf)
-    : alpha_(alpha),
-      xfermode_(xfermode),
-      has_bounds_(!!bounds),
-      color_filter_(cf) {
-  if (bounds)
-    bounds_ = SkRect(*bounds);
+CompositingDisplayItem::CompositingDisplayItem() {
 }
 
 CompositingDisplayItem::~CompositingDisplayItem() {
 }
 
+void CompositingDisplayItem::SetNew(uint8_t alpha,
+                                    SkXfermode::Mode xfermode,
+                                    SkRect* bounds,
+                                    skia::RefPtr<SkColorFilter> cf) {
+  alpha_ = alpha;
+  xfermode_ = xfermode;
+  has_bounds_ = !!bounds;
+  if (bounds)
+    bounds_ = SkRect(*bounds);
+  color_filter_ = cf;
+}
+
 void CompositingDisplayItem::Raster(SkCanvas* canvas,
                                     SkDrawPictureCallback* callback) const {
   SkPaint paint;