cc: Devirtualize DisplayItem::ExternalMemoryUsage().

cc/playback/clip_display_item.h

 // 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.
 
 #ifndef CC_PLAYBACK_CLIP_DISPLAY_ITEM_H_
 #define CC_PLAYBACK_CLIP_DISPLAY_ITEM_H_
 
 #include <stddef.h>
 
 #include <memory>
@@ skipping 14 matching lines @@
                   const std::vector<SkRRect>& rounded_clip_rects,
                   bool antialias);
   explicit ClipDisplayItem(const proto::DisplayItem& proto);
   ~ClipDisplayItem() override;
 
   void ToProtobuf(proto::DisplayItem* proto) const override;
   void Raster(SkCanvas* canvas,
               SkPicture::AbortCallback* callback) const override;
   void AsValueInto(const gfx::Rect& visual_rect,
                    base::trace_event::TracedValue* array) const override;
-  size_t ExternalMemoryUsage() const override;
 
+  size_t ExternalMemoryUsage() const {
+    return rounded_clip_rects_.capacity() * sizeof(rounded_clip_rects_[0]);
+  }
   int ApproximateOpCount() const { return 1; }
 
  private:
   void SetNew(const gfx::Rect& clip_rect,
               const std::vector<SkRRect>& rounded_clip_rects,
               bool antialias);
 
   gfx::Rect clip_rect_;
   std::vector<SkRRect> rounded_clip_rects_;
   bool antialias_;
 };
 
 class CC_EXPORT EndClipDisplayItem : public DisplayItem {
  public:
   EndClipDisplayItem();
   explicit EndClipDisplayItem(const proto::DisplayItem& proto);
   ~EndClipDisplayItem() override;
 
   void ToProtobuf(proto::DisplayItem* proto) const override;
   void Raster(SkCanvas* canvas,
               SkPicture::AbortCallback* callback) const override;
   void AsValueInto(const gfx::Rect& visual_rect,
                    base::trace_event::TracedValue* array) const override;
-  size_t ExternalMemoryUsage() const override;
 
   int ApproximateOpCount() const { return 0; }
 };
 
 }  // namespace cc
 
 #endif  // CC_PLAYBACK_CLIP_DISPLAY_ITEM_H_