[compositor-worker] root scrolling layer is associated with document scrolling element

third_party/WebKit/Source/core/dom/CompositorProxy.h

Index: third_party/WebKit/Source/core/dom/CompositorProxy.h
diff --git a/third_party/WebKit/Source/core/dom/CompositorProxy.h b/third_party/WebKit/Source/core/dom/CompositorProxy.h
index 37efc8446b9c7ccaee8fc3a31b967010ae1fd374..1cd8ac5631f5189200d97884a5e3257c08cc8309 100644
--- a/third_party/WebKit/Source/core/dom/CompositorProxy.h
+++ b/third_party/WebKit/Source/core/dom/CompositorProxy.h
@@ -31,13 +31,15 @@ class CORE_EXPORT CompositorProxy final
                                  const Vector<String>& attributeArray,
                                  ExceptionState&);
   static CompositorProxy* create(ExecutionContext*,
-                                 uint64_t element,
+                                 uint64_t elementId,
+                                 uint64_t scrollingNodeId,
                                  uint32_t compositorMutableProperties);
   virtual ~CompositorProxy();
 
   DEFINE_INLINE_TRACE() {}
 
   uint64_t elementId() const { return m_elementId; }
+  uint64_t scrollingNodeId() const { return m_scrollingNodeId; }
   uint32_t compositorMutableProperties() const {
     return m_compositorMutableProperties;
   }
@@ -60,9 +62,14 @@ class CORE_EXPORT CompositorProxy final
   void takeCompositorMutableState(std::unique_ptr<CompositorMutableState>);
 
  protected:
-  CompositorProxy(uint64_t elementId, uint32_t compositorMutableProperties);
-  CompositorProxy(Element&, const Vector<String>& attributeArray);
+  CompositorProxy(uint64_t elementId,
+                  uint64_t scrollingNodeId,
+                  uint32_t compositorMutableProperties);
+  CompositorProxy(Element&,
+                  Node& scrollingNode,
+                  const Vector<String>& attributeArray);
   CompositorProxy(uint64_t element,
+                  uint64_t scrollingNodeId,
                   uint32_t compositorMutableProperties,
                   CompositorProxyClient*);
 
@@ -72,6 +79,7 @@ class CORE_EXPORT CompositorProxy final
   void disconnectInternal();
 
   const uint64_t m_elementId = 0;
+  const uint64_t m_scrollingNodeId = 0;
   const uint32_t m_compositorMutableProperties = 0;
 
   bool m_connected = true;