Fix RenderGeometryMap ASSERT in touch hit rect computation

Source/core/page/scrolling/ScrollingCoordinator.cpp

Index: Source/core/page/scrolling/ScrollingCoordinator.cpp
diff --git a/Source/core/page/scrolling/ScrollingCoordinator.cpp b/Source/core/page/scrolling/ScrollingCoordinator.cpp
index 0c078331c2d9287e3f5eff978a2183e92a6e74a2..bfb1ae1d44a1dd29fb94b0e039351aa346de4715 100644
--- a/Source/core/page/scrolling/ScrollingCoordinator.cpp
+++ b/Source/core/page/scrolling/ScrollingCoordinator.cpp
@@ -504,10 +504,12 @@ static void convertLayerRectsToEnclosingCompositedLayer(Frame* mainFrame, const
     MapCoordinatesFlags flags = UseTransforms;
     if (touchHandlerInChildFrame)
         flags |= TraverseDocumentBoundaries;
+    RenderLayer* rootLayer = mainFrame->contentRenderer()->layer();
     RenderGeometryMap geometryMap(flags);
+    geometryMap.pushMappingsToAncestor(rootLayer, 0);
     LayerFrameMap layerChildFrameMap;
     makeLayerChildFrameMap(mainFrame, &layerChildFrameMap);
-    convertLayerRectsToEnclosingCompositedLayerRecursive(mainFrame->contentRenderer()->layer(), layerRects, compositorRects, geometryMap, layersWithRects, layerChildFrameMap);
+    convertLayerRectsToEnclosingCompositedLayerRecursive(rootLayer, layerRects, compositorRects, geometryMap, layersWithRects, layerChildFrameMap);
 }
 
 void ScrollingCoordinator::updateTouchEventTargetRectsIfNeeded()