Use scrollOrigin instead of minimumScrollPosition to calculate position.

third_party/WebKit/Source/core/layout/compositing/PaintLayerCompositor.cpp

Index: third_party/WebKit/Source/core/layout/compositing/PaintLayerCompositor.cpp
diff --git a/third_party/WebKit/Source/core/layout/compositing/PaintLayerCompositor.cpp b/third_party/WebKit/Source/core/layout/compositing/PaintLayerCompositor.cpp
index 6f2462f76095a105ba6d4e9555f07926cf0be158..f99b50298fbbb9248c92ce34042daf79d65be37e 100644
--- a/third_party/WebKit/Source/core/layout/compositing/PaintLayerCompositor.cpp
+++ b/third_party/WebKit/Source/core/layout/compositing/PaintLayerCompositor.cpp
@@ -633,11 +633,11 @@ void PaintLayerCompositor::frameViewDidScroll()
         scrollingCoordinatorHandlesOffset = scrollingCoordinator->scrollableAreaScrollLayerDidChange(frameView);
     }
 
-    // Scroll position = scroll minimum + scroll offset. Adjust the layer's
+    // Scroll position = scroll origin + scroll offset. Adjust the layer's
     // position to handle whatever the scroll coordinator isn't handling.
-    // The minimum scroll position is non-zero for RTL pages with overflow.
+    // The scroll origin is non-zero for RTL pages with overflow.
     if (scrollingCoordinatorHandlesOffset)
-        m_scrollLayer->setPosition(-frameView->minimumScrollPosition());
+        m_scrollLayer->setPosition(frameView->scrollOrigin());
     else
         m_scrollLayer->setPosition(-scrollPosition);