cc: Shrink size of display item

cc/playback/float_clip_display_item.h

Index: cc/playback/float_clip_display_item.h
diff --git a/cc/playback/float_clip_display_item.h b/cc/playback/float_clip_display_item.h
index 3dd788b03803fb4818b46de2aa766912627e51ce..6769c986ca3f729a953f095adcc01ab7880276c2 100644
--- a/cc/playback/float_clip_display_item.h
+++ b/cc/playback/float_clip_display_item.h
@@ -18,26 +18,31 @@ namespace cc {
 
 class CC_EXPORT FloatClipDisplayItem : public DisplayItem {
  public:
-  FloatClipDisplayItem();
+  explicit FloatClipDisplayItem(const gfx::RectF& clip_rect);
+  explicit FloatClipDisplayItem(const proto::DisplayItem& proto);
   ~FloatClipDisplayItem() override;
 
-  void SetNew(const gfx::RectF& clip_rect);
-
   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::RectF& clip_rect);
+
   gfx::RectF clip_rect_;
 };
 
 class CC_EXPORT EndFloatClipDisplayItem : public DisplayItem {
  public:
   EndFloatClipDisplayItem();
+  explicit EndFloatClipDisplayItem(const proto::DisplayItem& proto);
   ~EndFloatClipDisplayItem() override;
 
   static scoped_ptr<EndFloatClipDisplayItem> Create() {
@@ -45,12 +50,15 @@ class CC_EXPORT EndFloatClipDisplayItem : public DisplayItem {
   }
 
   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