cc: Use a ListContainer for DisplayItemList to reduce allocations.

cc/resources/clip_path_display_item.cc

Index: cc/resources/clip_path_display_item.cc
diff --git a/cc/resources/clip_path_display_item.cc b/cc/resources/clip_path_display_item.cc
index 275a7effd7b16d808835b7c1fe335bbb06e5f30e..1f425a9da610fda544b92d87cea5c136d65787b2 100644
--- a/cc/resources/clip_path_display_item.cc
+++ b/cc/resources/clip_path_display_item.cc
@@ -10,15 +10,20 @@
 
 namespace cc {
 
-ClipPathDisplayItem::ClipPathDisplayItem(const SkPath& clip_path,
-                                         SkRegion::Op clip_op,
-                                         bool antialias)
-    : clip_path_(clip_path), clip_op_(clip_op), antialias_(antialias) {
+ClipPathDisplayItem::ClipPathDisplayItem() {
 }
 
 ClipPathDisplayItem::~ClipPathDisplayItem() {
 }
 
+void ClipPathDisplayItem::SetNew(const SkPath& clip_path,
+                                 SkRegion::Op clip_op,
+                                 bool antialias) {
+  clip_path_ = clip_path;
+  clip_op_ = clip_op;
+  antialias_ = antialias;
+}
+
 void ClipPathDisplayItem::Raster(SkCanvas* canvas,
                                  SkDrawPictureCallback* callback) const {
   canvas->save();