Add a compositing display item which replaces transparency display item

cc/blink/web_display_item_list_impl.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_BLINK_WEB_DISPLAY_ITEM_LIST_IMPL_H_
 #define CC_BLINK_WEB_DISPLAY_ITEM_LIST_IMPL_H_
 
 #include "base/memory/ref_counted.h"
 #include "cc/blink/cc_blink_export.h"
 #include "cc/resources/display_item_list.h"
 #include "third_party/WebKit/public/platform/WebBlendMode.h"
 #include "third_party/WebKit/public/platform/WebContentLayerClient.h"
 #include "third_party/WebKit/public/platform/WebDisplayItemList.h"
 #include "third_party/WebKit/public/platform/WebFloatPoint.h"
 #include "third_party/WebKit/public/platform/WebVector.h"
 #include "third_party/skia/include/core/SkRegion.h"
+#include "third_party/skia/include/core/SkXfermode.h"
 #include "ui/gfx/geometry/point_f.h"
 
+class SkColorFilter;
 class SkImageFilter;
 class SkMatrix44;
 class SkPath;
 class SkPicture;
 class SkRRect;
 
 namespace cc_blink {
 
 class WebDisplayItemListImpl : public blink::WebDisplayItemList {
  public:
@@ skipping 12 matching lines @@
                                   SkRegion::Op clip_op,
                                   bool antialias);
   virtual void appendEndClipPathItem();
   virtual void appendFloatClipItem(const blink::WebFloatRect& clip_rect);
   virtual void appendEndFloatClipItem();
   virtual void appendTransformItem(const SkMatrix44& matrix);
   virtual void appendEndTransformItem();
   virtual void appendTransparencyItem(float opacity,
                                       blink::WebBlendMode blend_mode);
   virtual void appendEndTransparencyItem();
+  virtual void appendCompositingItem(float opacity,
+                                     SkXfermode::Mode,
+                                     SkColorFilter*);
+  virtual void appendEndCompositingItem();
   virtual void appendFilterItem(const blink::WebFilterOperations& filters,
                                 const blink::WebFloatRect& bounds);
   virtual void appendEndFilterItem();
   virtual void appendScrollItem(const blink::WebSize& scrollOffset,
                                 ScrollContainerId);
   virtual void appendEndScrollItem();
 
  private:
   scoped_refptr<cc::DisplayItemList> display_item_list_;
 
   DISALLOW_COPY_AND_ASSIGN(WebDisplayItemListImpl);
 };
 
 }  // namespace cc_blink
 
 #endif  // CC_BLINK_WEB_DISPLAY_ITEM_LIST_IMPL_H_