Enable ASSERT in positionFromPaintInvalidationContainer

Source/core/rendering/RenderObject.cpp

Index: Source/core/rendering/RenderObject.cpp
diff --git a/Source/core/rendering/RenderObject.cpp b/Source/core/rendering/RenderObject.cpp
index bd81e32052873b06a824de4a8a46a4fff3ca2797..5f9f1e3619b74a432815cd091e62b872d591ce08 100644
--- a/Source/core/rendering/RenderObject.cpp
+++ b/Source/core/rendering/RenderObject.cpp
@@ -1342,8 +1342,7 @@ void RenderObject::addChildFocusRingRects(Vector<IntRect>& rects, const LayoutPo
 
 LayoutPoint RenderObject::positionFromPaintInvalidationContainer(const RenderLayerModelObject* paintInvalidationContainer, const PaintInvalidationState* paintInvalidationState) const
 {
-    // FIXME: This assert should be re-enabled when we move paint invalidation to after compositing update. crbug.com/360286
-    // ASSERT(containerForPaintInvalidation() == paintInvalidationContainer);
+    ASSERT(containerForPaintInvalidation() == paintInvalidationContainer);
 
     if (paintInvalidationContainer == this)
         return LayoutPoint();