Revert of Calculate paint invalidation rect for scrollbars

third_party/WebKit/Source/core/frame/RootFrameViewport.cpp

 // 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.
 
 #include "config.h"
 #include "core/frame/RootFrameViewport.h"
 
 #include "core/frame/FrameView.h"
 #include "core/layout/ScrollAlignment.h"
 #include "platform/geometry/DoubleRect.h"
@@ skipping 192 matching lines @@
 bool RootFrameViewport::userInputScrollable(ScrollbarOrientation orientation) const
 {
     return visualViewport().userInputScrollable(orientation) || layoutViewport().userInputScrollable(orientation);
 }
 
 bool RootFrameViewport::shouldPlaceVerticalScrollbarOnLeft() const
 {
     return layoutViewport().shouldPlaceVerticalScrollbarOnLeft();
 }
 
-void RootFrameViewport::scrollControlWasSetNeedsPaintInvalidation()
+void RootFrameViewport::invalidateScrollbarRect(Scrollbar* scrollbar, const IntRect& rect)
 {
-    layoutViewport().scrollControlWasSetNeedsPaintInvalidation();
+    layoutViewport().invalidateScrollbarRect(scrollbar, rect);
+}
+
+void RootFrameViewport::invalidateScrollCornerRect(const IntRect& rect)
+{
+    layoutViewport().invalidateScrollCornerRect(rect);
 }
 
 GraphicsLayer* RootFrameViewport::layerForContainer() const
 {
     return layoutViewport().layerForContainer();
 }
 
 GraphicsLayer* RootFrameViewport::layerForScrolling() const
 {
     return layoutViewport().layerForScrolling();
@@ skipping 57 matching lines @@
 }
 
 DEFINE_TRACE(RootFrameViewport)
 {
     visitor->trace(m_visualViewport);
     visitor->trace(m_layoutViewport);
     ScrollableArea::trace(visitor);
 }
 
 } // namespace blink