Move logic of recording main thread scrolling reasons from cc to blink::ScrollManager

third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.h

Index: third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.h
diff --git a/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.h b/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.h
index af3638057b21ad9d63567520d83a252ac2a5eaff..6d381c1c2552a6d21d1bfc5e6797af8a52189df7 100644
--- a/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.h
+++ b/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.h
@@ -481,10 +481,8 @@ class CORE_EXPORT PaintLayerScrollableArea final
   void invalidateStickyConstraintsFor(PaintLayer*,
                                       bool needsCompositingUpdate = true);
 
-  void removeStyleRelatedMainThreadScrollingReasons();
-  void addStyleRelatedMainThreadScrollingReasons(const uint32_t);
-  bool hasMainThreadScrollingReason(uint32_t reason) const {
-    return m_reasons & reason;
+  uint32_t getNonCompositedMainThreadScrollingReasons() {
+    return m_nonCompositedMainThreadScrollingReasons;
   }
 
   uint64_t id() const;
@@ -595,7 +593,7 @@ class CORE_EXPORT PaintLayerScrollableArea final
   std::unique_ptr<PaintLayerScrollableAreaRareData> m_rareData;
 
   // MainThreadScrollingReason due to the properties of the LayoutObject
-  uint32_t m_reasons;
+  uint32_t m_nonCompositedMainThreadScrollingReasons;
 
 #if DCHECK_IS_ON()
   bool m_hasBeenDisposed;