cc: Use a ListContainer for DisplayItemList to reduce allocations.

cc/resources/clip_path_display_item.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/resources/clip_path_display_item.h"
 
 #include "base/strings/stringprintf.h"
 #include "base/trace_event/trace_event_argument.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 
 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();
   canvas->clipPath(clip_path_, clip_op_, antialias_);
 }
 
 bool ClipPathDisplayItem::IsSuitableForGpuRasterization() const {
   return true;
 }
 
@@ skipping 34 matching lines @@
 size_t EndClipPathDisplayItem::PictureMemoryUsage() const {
   return 0;
 }
 
 void EndClipPathDisplayItem::AsValueInto(
     base::trace_event::TracedValue* array) const {
   array->AppendString("EndClipPathDisplayItem");
 }
 
 }  // namespace cc