Reland of Use NGLogicalRect instead of NGExclusion for exclusions.

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

Index: third_party/WebKit/Source/core/layout/ng/ng_units.cc
diff --git a/third_party/WebKit/Source/core/layout/ng/ng_units.cc b/third_party/WebKit/Source/core/layout/ng/ng_units.cc
index 5537f4b37d567414e58bb74a1b4396480b7bf67a..71e9f0b0dea3928c3ff3da73cc714cc119753bea 100644
--- a/third_party/WebKit/Source/core/layout/ng/ng_units.cc
+++ b/third_party/WebKit/Source/core/layout/ng/ng_units.cc
@@ -26,6 +26,13 @@
 bool NGLogicalRect::IsEmpty() const {
   // TODO(layout-dev): equality check shouldn't allocate an object each time.
   return *this == NGLogicalRect();
+}
+
+bool NGLogicalRect::IsContained(const NGLogicalRect& other) const {
+  return !(InlineEndOffset() <= other.InlineStartOffset() ||
+           BlockEndOffset() <= other.BlockStartOffset() ||
+           InlineStartOffset() >= other.InlineEndOffset() ||
+           BlockStartOffset() >= other.BlockEndOffset());
 }
 
 bool NGLogicalRect::operator==(const NGLogicalRect& other) const {