[layoutng] Create a more correct constraint space for children

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

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NGUnits_h
 #define NGUnits_h
 
 #include "platform/LayoutUnit.h"
 
 namespace blink {
 
 class LayoutUnit;
 
 struct NGLogicalSize {
+  NGLogicalSize() {}
+  NGLogicalSize(LayoutUnit inlineSize, LayoutUnit blockSize)
+      : inlineSize(inlineSize), blockSize(blockSize) {}
+
   LayoutUnit inlineSize;
   LayoutUnit blockSize;
 };
 
 struct NGLogicalOffset {
   LayoutUnit inlineOffset;
   LayoutUnit blockOffset;
 };
 
 struct NGPhysicalSize {
@@ skipping 14 matching lines @@
 struct NGPixelSnappedPhysicalRect {
   int top;
   int left;
   int width;
   int height;
 };
 
 }  // namespace blink
 
 #endif  // NGUnits_h