MainFrame scrollbars should work with RFV instead of FV

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

Index: third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp
diff --git a/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp b/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp
index b5ff43d9e63497e3970144fc3f3c584c8fc61f91..fbe68ee3a72e3a03813f1fba774ea5350787c9e4 100644
--- a/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp
+++ b/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.cpp
@@ -50,6 +50,7 @@
 #include "core/dom/Node.h"
 #include "core/dom/shadow/ShadowRoot.h"
 #include "core/editing/FrameSelection.h"
+#include "core/editing/markers/DocumentMarkerController.h"
 #include "core/frame/FrameHost.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
@@ -670,6 +671,15 @@ void PaintLayerScrollableArea::updateScrollbarsEnabledState() {
   }
 }
 
+void PaintLayerScrollableArea::updateScrollbars() {
+  if (visualViewportSuppliesScrollbars())
+    return;
+
+  // TODO(crbug.com/661236): Refactor relevant bits from updateAfterLayout and
+  // call here.
+  updateAfterLayout();
+}
+
 void PaintLayerScrollableArea::updateAfterLayout() {
   DCHECK(box().hasOverflowClip());
 
@@ -1763,6 +1773,11 @@ PaintLayerScrollableArea::compositorAnimationTimeline() const {
   return nullptr;
 }
 
+void PaintLayerScrollableArea::getTickmarks(Vector<IntRect>& tickmarks) const {
+  if (LocalFrame* frame = box().frame())
+    frame->view()->getTickmarks(tickmarks);
+}
+
 PaintLayerScrollableArea*
 PaintLayerScrollableArea::ScrollbarManager::scrollableArea() {
   return toPaintLayerScrollableArea(m_scrollableArea.get());