cc: Shrink size of display item

cc/playback/clip_display_item.h

Index: cc/playback/clip_display_item.h
diff --git a/cc/playback/clip_display_item.h b/cc/playback/clip_display_item.h
index c66e4675750cbb1157b8b5cde00468335f3801e0..51402139f54fc410f1a658bd72e8ef62f6869748 100644
--- a/cc/playback/clip_display_item.h
+++ b/cc/playback/clip_display_item.h
@@ -19,21 +19,26 @@ namespace cc {
 
 class CC_EXPORT ClipDisplayItem : public DisplayItem {
  public:
-  ClipDisplayItem();
+  ClipDisplayItem(const gfx::Rect& clip_rect,
+                  const std::vector<SkRRect>& rounded_clip_rects);
+  explicit ClipDisplayItem(const proto::DisplayItem& proto);
   ~ClipDisplayItem() override;
 
-  void SetNew(gfx::Rect clip_rect,
-              const std::vector<SkRRect>& rounded_clip_rects);
-
   void ToProtobuf(proto::DisplayItem* proto) const override;
-  void FromProtobuf(const proto::DisplayItem& proto) override;
   void Raster(SkCanvas* canvas,
               const gfx::Rect& canvas_target_playback_rect,
               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 1; }
+  bool IsSuitableForGpuRasterization() const { return true; }
 
  private:
+  void SetNew(const gfx::Rect& clip_rect,
+              const std::vector<SkRRect>& rounded_clip_rects);
+
   gfx::Rect clip_rect_;
   std::vector<SkRRect> rounded_clip_rects_;
 };
@@ -41,15 +46,19 @@ class CC_EXPORT ClipDisplayItem : public DisplayItem {
 class CC_EXPORT EndClipDisplayItem : public DisplayItem {
  public:
   EndClipDisplayItem();
+  explicit EndClipDisplayItem(const proto::DisplayItem& proto);
   ~EndClipDisplayItem() override;
 
   void ToProtobuf(proto::DisplayItem* proto) const override;
-  void FromProtobuf(const proto::DisplayItem& proto) override;
   void Raster(SkCanvas* canvas,
               const gfx::Rect& canvas_target_playback_rect,
               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; }
+  bool IsSuitableForGpuRasterization() const { return true; }
 };
 
 }  // namespace cc