cc: Use a ListContainer for DisplayItemList to reduce allocations.

cc/resources/clip_display_item.cc

 // Copyright 2014 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_display_item.h"
 
 #include <string>
 
 #include "base/strings/stringprintf.h"
 #include "base/trace_event/trace_event_argument.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "ui/gfx/skia_util.h"
 
 namespace cc {
 
-ClipDisplayItem::ClipDisplayItem(gfx::Rect clip_rect,
-                                 const std::vector<SkRRect>& rounded_clip_rects)
-    : clip_rect_(clip_rect), rounded_clip_rects_(rounded_clip_rects) {
+ClipDisplayItem::ClipDisplayItem() {
 }
 
 ClipDisplayItem::~ClipDisplayItem() {
 }
 
+void ClipDisplayItem::SetNew(gfx::Rect clip_rect,
+                             const std::vector<SkRRect>& rounded_clip_rects) {
+  clip_rect_ = clip_rect;
+  rounded_clip_rects_ = rounded_clip_rects;
+}
+
 void ClipDisplayItem::Raster(SkCanvas* canvas,
                              SkDrawPictureCallback* callback) const {
   canvas->save();
   canvas->clipRect(SkRect::MakeXYWH(clip_rect_.x(), clip_rect_.y(),
                                     clip_rect_.width(), clip_rect_.height()));
   for (size_t i = 0; i < rounded_clip_rects_.size(); ++i) {
     if (rounded_clip_rects_[i].isRect()) {
       canvas->clipRect(rounded_clip_rects_[i].rect());
     } else {
       bool antialiased = true;
@@ skipping 67 matching lines @@
 size_t EndClipDisplayItem::PictureMemoryUsage() const {
   return 0;
 }
 
 void EndClipDisplayItem::AsValueInto(
     base::trace_event::TracedValue* array) const {
   array->AppendString("EndClipDisplayItem");
 }
 
 }  // namespace cc