cc: Shrink size of display item

cc/playback/clip_path_display_item.h

Index: cc/playback/clip_path_display_item.h
diff --git a/cc/playback/clip_path_display_item.h b/cc/playback/clip_path_display_item.h
index 6f37ebea7f0fc92eba08a5c446ad8e75b65f54c8..6dc7c800a915042eafa2cf55a49af3f96341cd72 100644
--- a/cc/playback/clip_path_display_item.h
+++ b/cc/playback/clip_path_display_item.h
@@ -17,7 +17,8 @@ namespace cc {
 
 class CC_EXPORT ClipPathDisplayItem : public DisplayItem {
  public:
-  ClipPathDisplayItem();
+  ClipPathDisplayItem(const SkPath& path, SkRegion::Op clip_op, bool antialias);
+  explicit ClipPathDisplayItem(const proto::DisplayItem& proto);
   ~ClipPathDisplayItem() override;
 
   void SetNew(const SkPath& path, SkRegion::Op clip_op, bool antialias);
@@ -29,6 +30,8 @@ class CC_EXPORT ClipPathDisplayItem : public DisplayItem {
               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 override;
 
  private:
   SkPath clip_path_;
@@ -39,6 +42,7 @@ class CC_EXPORT ClipPathDisplayItem : public DisplayItem {
 class CC_EXPORT EndClipPathDisplayItem : public DisplayItem {
  public:
   EndClipPathDisplayItem();
+  explicit EndClipPathDisplayItem(const proto::DisplayItem& proto);
   ~EndClipPathDisplayItem() override;
 
   static scoped_ptr<EndClipPathDisplayItem> Create() {
@@ -52,6 +56,8 @@ class CC_EXPORT EndClipPathDisplayItem : public DisplayItem {
               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 override;
 };
 
 }  // namespace cc