[layoutng] Support computing min-content and max-content

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

Index: third_party/WebKit/Source/core/layout/ng/ng_box.h
diff --git a/third_party/WebKit/Source/core/layout/ng/ng_box.h b/third_party/WebKit/Source/core/layout/ng/ng_box.h
index a402ad24c2b1cde35a50da3d5d4b05ffe32b9f1e..aea19d1bffe91e455d40e8ff447dd4b0ad1be711 100644
--- a/third_party/WebKit/Source/core/layout/ng/ng_box.h
+++ b/third_party/WebKit/Source/core/layout/ng/ng_box.h
@@ -17,6 +17,7 @@ class NGBlockLayoutAlgorithm;
 class NGConstraintSpace;
 class NGFragment;
 class NGPhysicalFragment;
+struct MinAndMaxContentSizes;
 
 // Represents a node to be laid out.
 class CORE_EXPORT NGBox final : public GarbageCollectedFinalized<NGBox> {
@@ -32,6 +33,15 @@ class CORE_EXPORT NGBox final : public GarbageCollectedFinalized<NGBox> {
   // TODO(layout-ng): Should we have a StartLayout function to avoid passing
   // the same space for each Layout iteration?
   bool Layout(const NGConstraintSpace*, NGFragment**);
+
+  // Computes the value of min-content and max-content for this box.
+  // The return value has the same meaning as for Layout.
+  // It is not legal to interleave a pending Layout() with a pending
+  // ComputeOrSynthesizeMinAndMaxContentSizes (i.e. you have to call Layout
+  // often enough that it returns true before calling
+  // ComputeOrSynthesizeMinAndMaxContentSizes)
+  bool ComputeOrSynthesizeMinAndMaxContentSizes(MinAndMaxContentSizes*);
+
   const ComputedStyle* Style() const;
 
   NGBox* NextSibling();
@@ -41,12 +51,7 @@ class CORE_EXPORT NGBox final : public GarbageCollectedFinalized<NGBox> {
   void SetNextSibling(NGBox*);
   void SetFirstChild(NGBox*);
 
-  DEFINE_INLINE_VIRTUAL_TRACE() {
-    visitor->trace(algorithm_);
-    visitor->trace(fragment_);
-    visitor->trace(next_sibling_);
-    visitor->trace(first_child_);
-  }
+  DECLARE_VIRTUAL_TRACE();
 
  private:
   // This is necessary for interop between old and new trees -- after our parent