Top down version of algorithm to position margins and floats in LayoutNG

third_party/WebKit/Source/core/layout/ng/ng_floating_object.h

Index: third_party/WebKit/Source/core/layout/ng/ng_floating_object.h
diff --git a/third_party/WebKit/Source/core/layout/ng/ng_floating_object.h b/third_party/WebKit/Source/core/layout/ng/ng_floating_object.h
index c32a93152c63648b99036ce25c3981c33d749875..68a84315fb779c6785dd21e6f4895525e199adef 100644
--- a/third_party/WebKit/Source/core/layout/ng/ng_floating_object.h
+++ b/third_party/WebKit/Source/core/layout/ng/ng_floating_object.h
@@ -20,7 +20,7 @@ class NGPhysicalFragment;
 struct CORE_EXPORT NGFloatingObject
     : public GarbageCollected<NGFloatingObject> {
   NGFloatingObject(NGPhysicalFragment* fragment,
-                   const NGConstraintSpace* space,
+                   NGConstraintSpace* space,
                    NGBlockNode* node,
                    const ComputedStyle& style,
                    const NGBoxStrut& margins)
@@ -32,7 +32,8 @@ struct CORE_EXPORT NGFloatingObject
   }
 
   Member<NGPhysicalFragment> fragment;
-  Member<const NGConstraintSpace> space;
+  // TODO(glebl): Constraint space should be const here.
+  Member<NGConstraintSpace> space;
   Member<NGBlockNode> node;
   NGExclusion::Type exclusion_type;
   EClear clear_type;