[cc] Change semantics of fixed-pos container layer

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 5bd2202e29af58b6b0d83f6cc720535872bd2d03..d1a163bc1aef3294b8118a93f560bd192d8c1574 100644
--- a/third_party/WebKit/Source/core/layout/compositing/PaintLayerCompositor.cpp
+++ b/third_party/WebKit/Source/core/layout/compositing/PaintLayerCompositor.cpp
@@ -1190,9 +1190,10 @@ void PaintLayerCompositor::EnsureRootLayer() {
     container_layer_ = GraphicsLayer::Create(this);
     scroll_layer_ = GraphicsLayer::Create(this);
     if (ScrollingCoordinator* scrolling_coordinator =
-            this->GetScrollingCoordinator())
+            this->GetScrollingCoordinator()) {
       scrolling_coordinator->SetLayerIsContainerForFixedPositionLayers(
-          scroll_layer_.get(), true);
+          container_layer_.get(), true);
+    }
 
     // In RLS mode, LayoutView scrolling contents layer gets this element ID (in
     // CompositedLayerMapping::updateElementIdAndCompositorMutableProperties).