Rewrite blink->cc scroll offset logic for SPV2

third_party/WebKit/Source/platform/graphics/compositing/PropertyTreeManager.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 PropertyTreeManager_h
 #define PropertyTreeManager_h
 
 #include "wtf/HashMap.h"
 #include "wtf/HashSet.h"
 #include "wtf/Noncopyable.h"
@@ skipping 65 matching lines @@
   int ensureCompositorTransformNode(const TransformPaintPropertyNode*);
   int ensureCompositorClipNode(const ClipPaintPropertyNode*);
   int ensureCompositorScrollNode(const ScrollPaintPropertyNode*);
 
   int switchToEffectNode(const EffectPaintPropertyNode& nextEffect);
   int getCurrentCompositorEffectNodeIndex() const {
     return m_effectStack.back().id;
   }
 
   // Scroll offset has special treatment in the transform and scroll trees.
-  void updateScrollOffset(int layerId, int scrollId);
+  void updateScrollOffset(const ScrollPaintPropertyNode*);
 
  private:
   void buildEffectNodesRecursively(const EffectPaintPropertyNode* nextEffect);
 
   cc::TransformTree& transformTree();
   cc::ClipTree& clipTree();
   cc::EffectTree& effectTree();
   cc::ScrollTree& scrollTree();
 
   const EffectPaintPropertyNode* currentEffectNode() const;
@@ skipping 19 matching lines @@
   Vector<BlinkEffectAndCcIdPair> m_effectStack;
 
 #if DCHECK_IS_ON()
   HashSet<const EffectPaintPropertyNode*> m_effectNodesConverted;
 #endif
 };
 
 }  // namespace blink
 
 #endif  // PropertyTreeManager_h