Remove GraphicsLayer::didScroll and directly call ScrollableArea::didScroll

third_party/WebKit/Source/core/page/scrolling/ScrollingCoordinator.cpp

 /*
  * Copyright (C) 2011 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 469 matching lines @@
   if (scrollLayer) {
     bool isForVisualViewport =
         scrollableArea == &m_page->frameHost().visualViewport();
     scrollLayer->setScrollableArea(scrollableArea, isForVisualViewport);
   }
 
   WebLayer* webLayer = toWebLayer(scrollableArea->layerForScrolling());
   WebLayer* containerLayer = toWebLayer(scrollableArea->layerForContainer());
   if (webLayer) {
     webLayer->setScrollClipLayer(containerLayer);
-    DoublePoint scrollPosition(FloatPoint(scrollableArea->scrollOrigin()) +
-                               scrollableArea->getScrollOffset());
-    webLayer->setScrollPositionDouble(scrollPosition);
+    FloatPoint scrollPosition(scrollableArea->scrollOrigin() +
+                              scrollableArea->getScrollOffset());
+    webLayer->setScrollPosition(scrollPosition);
 
     webLayer->setBounds(scrollableArea->contentsSize());
     bool canScrollX = scrollableArea->userInputScrollable(HorizontalScrollbar);
     bool canScrollY = scrollableArea->userInputScrollable(VerticalScrollbar);
     webLayer->setUserScrollable(canScrollX, canScrollY);
   }
   if (WebScrollbarLayer* scrollbarLayer =
           getWebScrollbarLayer(scrollableArea, HorizontalScrollbar)) {
     GraphicsLayer* horizontalScrollbarLayer =
         scrollableArea->layerForHorizontalScrollbar();
@@ skipping 685 matching lines @@
           frameView ? toWebLayer(frameView->layoutViewportScrollableArea()
                                      ->layerForScrolling())
                     : nullptr) {
     return WebSize(frameView->layoutViewportScrollableArea()->contentsSize()) !=
            scrollLayer->bounds();
   }
   return false;
 }
 
 }  // namespace blink