Remove unused transparency display items.

cc/resources/transparency_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_RESOURCES_TRANSPARENCY_DISPLAY_ITEM_H_
-#define CC_RESOURCES_TRANSPARENCY_DISPLAY_ITEM_H_
-
-#include "base/memory/scoped_ptr.h"
-#include "cc/base/cc_export.h"
-#include "cc/resources/display_item.h"
-#include "skia/ext/refptr.h"
-#include "third_party/skia/include/core/SkXfermode.h"
-#include "ui/gfx/geometry/rect_f.h"
-
-class SkCanvas;
-class SkDrawPictureCallback;
-
-namespace cc {
-
-class CC_EXPORT TransparencyDisplayItem : public DisplayItem {
- public:
-  ~TransparencyDisplayItem() override;
-
-  static scoped_ptr<TransparencyDisplayItem> Create(
-      float opacity,
-      SkXfermode::Mode blend_mode) {
-    return make_scoped_ptr(new TransparencyDisplayItem(opacity, blend_mode));
-  }
-
-  void Raster(SkCanvas* canvas, SkDrawPictureCallback* callback) const override;
-
-  bool IsSuitableForGpuRasterization() const override;
-  int ApproximateOpCount() const override;
-  size_t PictureMemoryUsage() const override;
-  void AsValueInto(base::trace_event::TracedValue* array) const override;
-
- protected:
-  TransparencyDisplayItem(float opacity, SkXfermode::Mode blend_mode);
-
- private:
-  float opacity_;
-  SkXfermode::Mode blend_mode_;
-};
-
-class CC_EXPORT EndTransparencyDisplayItem : public DisplayItem {
- public:
-  ~EndTransparencyDisplayItem() override;
-
-  static scoped_ptr<EndTransparencyDisplayItem> Create() {
-    return make_scoped_ptr(new EndTransparencyDisplayItem());
-  }
-
-  void Raster(SkCanvas* canvas, SkDrawPictureCallback* callback) const override;
-
-  bool IsSuitableForGpuRasterization() const override;
-  int ApproximateOpCount() const override;
-  size_t PictureMemoryUsage() const override;
-  void AsValueInto(base::trace_event::TracedValue* array) const override;
-
- protected:
-  EndTransparencyDisplayItem();
-};
-
-}  // namespace cc
-
-#endif  // CC_RESOURCES_TRANSPARENCY_DISPLAY_ITEM_H_