[RootLayerScrolls] Annotate non-fast-scroll regions to correct layer

third_party/WebKit/Source/core/page/scrolling/ScrollingCoordinator.cpp

Index: third_party/WebKit/Source/core/page/scrolling/ScrollingCoordinator.cpp
diff --git a/third_party/WebKit/Source/core/page/scrolling/ScrollingCoordinator.cpp b/third_party/WebKit/Source/core/page/scrolling/ScrollingCoordinator.cpp
index fb8d5ea45911c55f0643bdc8e47dcf69bca751b7..90ffa14352af757a84d44e05f77c3eb11233fb38 100644
--- a/third_party/WebKit/Source/core/page/scrolling/ScrollingCoordinator.cpp
+++ b/third_party/WebKit/Source/core/page/scrolling/ScrollingCoordinator.cpp
@@ -112,8 +112,10 @@ void ScrollingCoordinator::setShouldHandleScrollGestureOnMainThreadRegion(
   if (!m_page->mainFrame()->isLocalFrame() ||
       !m_page->deprecatedLocalMainFrame()->view())
     return;
-  if (WebLayer* scrollLayer = toWebLayer(
-          m_page->deprecatedLocalMainFrame()->view()->layerForScrolling())) {
+  if (WebLayer* scrollLayer = toWebLayer(m_page->deprecatedLocalMainFrame()
+                                             ->view()
+                                             ->layoutViewportScrollableArea()
+                                             ->layerForScrolling())) {
     Vector<IntRect> rects = region.rects();
     WebVector<WebRect> webRects(rects.size());
     for (size_t i = 0; i < rects.size(); ++i)