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

third_party/WebKit/Source/platform/scroll/ScrollableArea.cpp

 /*
  * Copyright (c) 2010, Google Inc. All rights reserved.
  * Copyright (C) 2008, 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 644 matching lines @@
   FloatQuad result(quad);
   result.move(-getScrollOffset());
   return result;
 }
 
 IntSize ScrollableArea::excludeScrollbars(const IntSize& size) const {
   return IntSize(std::max(0, size.width() - verticalScrollbarWidth()),
                  std::max(0, size.height() - horizontalScrollbarHeight()));
 }
 
+void ScrollableArea::didScroll(const gfx::ScrollOffset& offset) {
+  ScrollOffset newOffset = ScrollOffset(offset.x() - scrollOrigin().x(),
+                                        offset.y() - scrollOrigin().y());
+  setScrollOffset(newOffset, CompositorScroll);
+}
+
 DEFINE_TRACE(ScrollableArea) {
   visitor->trace(m_scrollAnimator);
   visitor->trace(m_programmaticScrollAnimator);
 }
 
 }  // namespace blink