Check if fragment's block size fits into a layout opportunity.

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

Index: third_party/WebKit/Source/core/layout/ng/ng_layout_opportunity_iterator.cc
diff --git a/third_party/WebKit/Source/core/layout/ng/ng_layout_opportunity_iterator.cc b/third_party/WebKit/Source/core/layout/ng/ng_layout_opportunity_iterator.cc
index dce977f66cf0d72810937b5bab44cfa6a21c7473..5a7c8949542f92b7137233b6a8a93bf015b429b1 100644
--- a/third_party/WebKit/Source/core/layout/ng/ng_layout_opportunity_iterator.cc
+++ b/third_party/WebKit/Source/core/layout/ng/ng_layout_opportunity_iterator.cc
@@ -271,10 +271,10 @@ NGLayoutOpportunity FindLayoutOpportunityForFragment(
   NGLayoutOpportunity opportunity_candidate = opportunity_iter.Next();
   while (!opportunity_candidate.IsEmpty()) {
     opportunity = opportunity_candidate;
-    // Checking opportunity's block size is not necessary as a float cannot be
-    // positioned on top of another float inside of the same constraint space.
     auto fragment_inline_size = fragment.InlineSize() + margins.InlineSum();
-    if (opportunity.size.inline_size >= fragment_inline_size)
+    auto fragment_block_size = fragment.BlockSize() + margins.BlockSum();
+    if (opportunity.size.inline_size >= fragment_inline_size &&
+        opportunity.size.block_size >= fragment_block_size)
       break;
     opportunity_candidate = opportunity_iter.Next();
   }