cc: Shrink size of display item

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 <vector>
 
 #include "base/memory/scoped_ptr.h"
 #include "cc/base/cc_export.h"
 #include "cc/playback/display_item.h"
 #include "third_party/skia/include/core/SkRRect.h"
 #include "ui/gfx/geometry/rect.h"
 
 class SkCanvas;
 
 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_;
 };
 
 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
 
 #endif  // CC_PLAYBACK_CLIP_DISPLAY_ITEM_H_