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 d24d79670ec318bbe425e2f953f40ce35ecc177f..37b8d5dc105b9ceceb292881c06446bf87cea118 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"
@@ -1740,6 +1741,13 @@ PaintLayerScrollableArea::compositorAnimationTimeline() const {
   return nullptr;
 }
 
+void PaintLayerScrollableArea::getTickmarks(Vector<IntRect>& tickmarks) const {
+  if (LocalFrame* frame = box().frame()) {
+    tickmarks = frame->document()->markers().renderedRectsForMarkers(
+        DocumentMarker::TextMatch);

[bokan, 2016/10/31 15:25:09]

Does this make the tickmarks work for root-layer-scrolling?

[ymalik, 2016/11/03 18:49:12]

Almost. I am not sure where the tickmarks should be stored for
root-layer-scrolls. But currently, tickmarks are always stored in FV. 

This is the default behavior of FV when m_tickmarks is not set. I think this
will be needed for root-layer-scrolling but not sure if its the only thing
needed/

+  }
+}
+
 PaintLayerScrollableArea*
 PaintLayerScrollableArea::ScrollbarManager::scrollableArea() {
   return toPaintLayerScrollableArea(m_scrollableArea.get());