cc: Shrink size of display item

cc/playback/drawing_display_item.cc

Index: cc/playback/drawing_display_item.cc
diff --git a/cc/playback/drawing_display_item.cc b/cc/playback/drawing_display_item.cc
index 05935778582c5d8d11b716610cac185db21816d5..88d4228512f02cfebb84a25c17ddd1510980c680 100644
--- a/cc/playback/drawing_display_item.cc
+++ b/cc/playback/drawing_display_item.cc
@@ -21,7 +21,18 @@
 
 namespace cc {
 
-DrawingDisplayItem::DrawingDisplayItem() {
+DrawingDisplayItem::DrawingDisplayItem() {}
+
+DrawingDisplayItem::DrawingDisplayItem(skia::RefPtr<SkPicture> picture) {
+  SetNew(std::move(picture));
+}
+
+DrawingDisplayItem::DrawingDisplayItem(const proto::DisplayItem& proto) {
+  FromProtobuf(proto);
+}
+
+DrawingDisplayItem::DrawingDisplayItem(const DrawingDisplayItem& item) {
+  item.CloneTo(this);
 }
 
 DrawingDisplayItem::~DrawingDisplayItem() {
@@ -29,9 +40,6 @@ DrawingDisplayItem::~DrawingDisplayItem() {
 
 void DrawingDisplayItem::SetNew(skia::RefPtr<SkPicture> picture) {
   picture_ = std::move(picture);
-  DisplayItem::SetNew(picture_->suitableForGpuRasterization(NULL),
-                      picture_->approximateOpCount(),
-                      SkPictureUtils::ApproximateBytesUsed(picture_.get()));
 }
 
 void DrawingDisplayItem::ToProtobuf(proto::DisplayItem* proto) const {
@@ -119,4 +127,16 @@ void DrawingDisplayItem::CloneTo(DrawingDisplayItem* item) const {
   item->SetNew(picture_);
 }
 
+size_t DrawingDisplayItem::ExternalMemoryUsage() const {
+  return SkPictureUtils::ApproximateBytesUsed(picture_.get());
+}
+
+int DrawingDisplayItem::ApproximateOpCount() const {
+  return picture_->approximateOpCount();
+}
+
+bool DrawingDisplayItem::IsSuitableForGpuRasterization() const {
+  return picture_->suitableForGpuRasterization(NULL);
+}
+
 }  // namespace cc