cc: Shrink size of display item

cc/playback/compositing_display_item.h

 // Copyright 2015 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_COMPOSITING_DISPLAY_ITEM_H_
 #define CC_PLAYBACK_COMPOSITING_DISPLAY_ITEM_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "cc/base/cc_export.h"
 #include "cc/playback/display_item.h"
 #include "skia/ext/refptr.h"
 #include "third_party/skia/include/core/SkColorFilter.h"
 #include "third_party/skia/include/core/SkRect.h"
 #include "third_party/skia/include/core/SkXfermode.h"
 #include "ui/gfx/geometry/rect_f.h"
 
 class SkCanvas;
 
 namespace cc {
 
 class CC_EXPORT CompositingDisplayItem : public DisplayItem {
  public:
-  CompositingDisplayItem();
+  CompositingDisplayItem(uint8_t alpha,
+                         SkXfermode::Mode xfermode,
+                         SkRect* bounds,
+                         skia::RefPtr<SkColorFilter> color_filter);
+  explicit CompositingDisplayItem(const proto::DisplayItem& proto);
   ~CompositingDisplayItem() override;
 
+  void ToProtobuf(proto::DisplayItem* proto) const 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; }
+
+ protected:
+  void FromProtobuf(const proto::DisplayItem& proto) override;
+
+ private:
   void SetNew(uint8_t alpha,
               SkXfermode::Mode xfermode,
               SkRect* bounds,
               skia::RefPtr<SkColorFilter> color_filter);
 
-  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;
-
- private:
   uint8_t alpha_;
   SkXfermode::Mode xfermode_;
   bool has_bounds_;
   SkRect bounds_;
   skia::RefPtr<SkColorFilter> color_filter_;
 };
 
 class CC_EXPORT EndCompositingDisplayItem : public DisplayItem {
  public:
   EndCompositingDisplayItem();
+  explicit EndCompositingDisplayItem(const proto::DisplayItem& proto);
   ~EndCompositingDisplayItem() override;
 
   static scoped_ptr<EndCompositingDisplayItem> Create() {
     return make_scoped_ptr(new EndCompositingDisplayItem());
   }
 
   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; }
+
+ protected:
+  void FromProtobuf(const proto::DisplayItem& proto) override;
 };
 
 }  // namespace cc
 
 #endif  // CC_PLAYBACK_COMPOSITING_DISPLAY_ITEM_H_