Trim Skia dependencies in Blink

third_party/WebKit/public/platform/WebDisplayItemList.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 WebDisplayItemList_h
 #define WebDisplayItemList_h
 
 #include "WebBlendMode.h"
 #include "WebFloatPoint.h"
 #include "WebFloatRect.h"
 #include "WebRect.h"
 #include "WebSize.h"
 #include "WebVector.h"
 
-#include "third_party/skia/include/core/SkColorFilter.h"
-#include "third_party/skia/include/core/SkRRect.h"
 #include "third_party/skia/include/core/SkRefCnt.h"
 #include "third_party/skia/include/core/SkRegion.h"
 #include "third_party/skia/include/core/SkXfermode.h"
-#include "third_party/skia/include/utils/SkMatrix44.h"
 
+class SkColorFilter;
 class SkImageFilter;
 class SkMatrix44;
 class SkPicture;
+struct SkRect;
+class SkRRect;
 
 namespace cc {
 class FilterOperations;
 }
 
 namespace blink {
 
 // An ordered list of items representing content to be rendered (stored in
 // 'drawing' items) and operations to be performed when rendering this content
 // (stored in 'clip', 'transform', 'filter', etc...). For more details see:
@@ skipping 22 matching lines @@
 
     // Scroll containers are identified by an opaque pointer.
     using ScrollContainerId = const void*;
     virtual void appendScrollItem(const WebRect& visualRect, const WebSize& scrollOffset, ScrollContainerId) { }
     virtual void appendEndScrollItem(const WebRect& visualRect) { }
 };
 
 } // namespace blink
 
 #endif // WebDisplayItemList_h