cc: Devirtualize DisplayItem::ExternalMemoryUsage().

cc/playback/compositing_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/playback/compositing_display_item.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/strings/stringprintf.h"
 #include "base/trace_event/trace_event_argument.h"
 #include "cc/proto/display_item.pb.h"
 #include "cc/proto/gfx_conversions.h"
 #include "cc/proto/skia_conversions.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "third_party/skia/include/core/SkData.h"
 #include "third_party/skia/include/core/SkFlattenable.h"
 #include "third_party/skia/include/core/SkFlattenableSerialization.h"
 #include "third_party/skia/include/core/SkPaint.h"
 
 #include "ui/gfx/skia_util.h"
 
 namespace cc {
 
 CompositingDisplayItem::CompositingDisplayItem(
     uint8_t alpha,
     SkBlendMode xfermode,
     SkRect* bounds,
     sk_sp<SkColorFilter> cf,
-    bool lcd_text_requires_opaque_layer) {
+    bool lcd_text_requires_opaque_layer)
+    : DisplayItem(COMPOSITING) {
   SetNew(alpha, xfermode, bounds, std::move(cf),
          lcd_text_requires_opaque_layer);
 }
 
-CompositingDisplayItem::CompositingDisplayItem(
-    const proto::DisplayItem& proto) {
+CompositingDisplayItem::CompositingDisplayItem(const proto::DisplayItem& proto)
+    : DisplayItem(COMPOSITING) {
   DCHECK_EQ(proto::DisplayItem::Type_Compositing, proto.type());
 
   const proto::CompositingDisplayItem& details = proto.compositing_item();
   uint8_t alpha = static_cast<uint8_t>(details.alpha());
   SkBlendMode xfermode = SkXfermodeModeFromProto(details.mode());
   std::unique_ptr<SkRect> bounds;
   if (details.has_bounds()) {
     bounds.reset(
         new SkRect(gfx::RectFToSkRect(ProtoToRectF(details.bounds()))));
   }
@@ skipping 70 matching lines @@
       alpha_, static_cast<int>(xfermode_), visual_rect.ToString().c_str());
   if (has_bounds_) {
     base::StringAppendF(
         &info, ", bounds: [%f, %f, %f, %f]", static_cast<float>(bounds_.x()),
         static_cast<float>(bounds_.y()), static_cast<float>(bounds_.width()),
         static_cast<float>(bounds_.height()));
   }
   array->AppendString(info);
 }
 
-size_t CompositingDisplayItem::ExternalMemoryUsage() const {
-  // TODO(pdr): Include color_filter's memory here.
-  return 0;
-}
-
-EndCompositingDisplayItem::EndCompositingDisplayItem() {}
+EndCompositingDisplayItem::EndCompositingDisplayItem()
+    : DisplayItem(END_COMPOSITING) {}
 
 EndCompositingDisplayItem::EndCompositingDisplayItem(
-    const proto::DisplayItem& proto) {
+    const proto::DisplayItem& proto)
+    : DisplayItem(END_COMPOSITING) {
   DCHECK_EQ(proto::DisplayItem::Type_EndCompositing, proto.type());
 }
 
 EndCompositingDisplayItem::~EndCompositingDisplayItem() {
 }
 
 void EndCompositingDisplayItem::ToProtobuf(proto::DisplayItem* proto) const {
   proto->set_type(proto::DisplayItem::Type_EndCompositing);
 }
 
 void EndCompositingDisplayItem::Raster(
     SkCanvas* canvas,
     SkPicture::AbortCallback* callback) const {
   canvas->restore();
 }
 
 void EndCompositingDisplayItem::AsValueInto(
     const gfx::Rect& visual_rect,
     base::trace_event::TracedValue* array) const {
   array->AppendString(
       base::StringPrintf("EndCompositingDisplayItem visualRect: [%s]",
                          visual_rect.ToString().c_str()));
 }
 
-size_t EndCompositingDisplayItem::ExternalMemoryUsage() const {
-  return 0;
-}
-
 }  // namespace cc