[LayoutNG] Introduces NGPhysicalConstraintSpace and makes NGConstraintSpace a "view".

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

Index: third_party/WebKit/Source/core/layout/ng/ng_layout_algorithm.h
diff --git a/third_party/WebKit/Source/core/layout/ng/ng_layout_algorithm.h b/third_party/WebKit/Source/core/layout/ng/ng_layout_algorithm.h
index b77f270ad86a55dfe7ae3c9ba9181acd5b592779..20321dccbf30e21fd0962dee819ff1f2b000b819 100644
--- a/third_party/WebKit/Source/core/layout/ng/ng_layout_algorithm.h
+++ b/third_party/WebKit/Source/core/layout/ng/ng_layout_algorithm.h
@@ -27,7 +27,7 @@ class CORE_EXPORT NGLayoutAlgorithm {
   // resulting layout information.
   // This function can not be const because for interruptible layout, we have
   // to be able to store state information.
-  virtual NGFragment* layout(const NGConstraintSpace&) = 0;
+  virtual NGFragment* layout(const NGConstraintSpace*) = 0;
 };
 
 }  // namespace blink