Reland of place pinch scrollbars with regular scrollbars.

Source/core/paint/DeprecatedPaintLayerScrollableArea.cpp

Index: Source/core/paint/DeprecatedPaintLayerScrollableArea.cpp
diff --git a/Source/core/paint/DeprecatedPaintLayerScrollableArea.cpp b/Source/core/paint/DeprecatedPaintLayerScrollableArea.cpp
index 63f56eff5de1c566f985714effbe658a72e07934..a290b96661cc35457981b9d584b6d8ca889dd39f 100644
--- a/Source/core/paint/DeprecatedPaintLayerScrollableArea.cpp
+++ b/Source/core/paint/DeprecatedPaintLayerScrollableArea.cpp
@@ -49,6 +49,7 @@
 #include "core/dom/Node.h"
 #include "core/dom/shadow/ShadowRoot.h"
 #include "core/editing/FrameSelection.h"
+#include "core/frame/FrameHost.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Settings.h"
@@ -170,6 +171,13 @@
     return nullptr;
 }
 
+GraphicsLayer* DeprecatedPaintLayerScrollableArea::layerForScrollbarContainer() const
+{
+    if (layer()->isRootLayer())
+        return box().frame()->host()->visualViewport().layerForScrollbarContainer();
+    return layerForContainer();
+}
+
 GraphicsLayer* DeprecatedPaintLayerScrollableArea::layerForScrolling() const
 {
     return layer()->hasCompositedDeprecatedPaintLayerMapping() ? layer()->compositedDeprecatedPaintLayerMapping()->scrollingContentsLayer() : 0;