Use Layout Opportunity Iterator to position new FC blocks.

third_party/WebKit/Source/core/layout/ng/inline/ng_inline_layout_algorithm.cc

Index: third_party/WebKit/Source/core/layout/ng/inline/ng_inline_layout_algorithm.cc
diff --git a/third_party/WebKit/Source/core/layout/ng/inline/ng_inline_layout_algorithm.cc b/third_party/WebKit/Source/core/layout/ng/inline/ng_inline_layout_algorithm.cc
index d78d6b0761ca57ea16f2a0389a06c37edbcd456c..2d745d4480cbb8604073ea68f6c307c08980e4d0 100644
--- a/third_party/WebKit/Source/core/layout/ng/inline/ng_inline_layout_algorithm.cc
+++ b/third_party/WebKit/Source/core/layout/ng/inline/ng_inline_layout_algorithm.cc
@@ -280,8 +280,7 @@ bool NGInlineLayoutAlgorithm::CreateLineUpToLastBreakOpportunity() {
 
   NGLogicalOffset origin_point =
       GetOriginPointForFloats(ConstraintSpace(), content_size_);
-  PositionPendingFloats(origin_point.block_offset, MutableConstraintSpace(),
-                        &container_builder_);
+  PositionPendingFloats(origin_point.block_offset);
   FindNextLayoutOpportunity();
   return true;
 }
@@ -360,9 +359,8 @@ void NGInlineLayoutAlgorithm::LayoutAndPositionFloat(
       float_does_not_fit) {
     container_builder_.AddUnpositionedFloat(floating_object);
   } else {
-    NGLogicalOffset offset =
+    floating_object->logical_offset =
         PositionFloat(floating_object.Get(), MutableConstraintSpace());
-    container_builder_.AddFloatingObject(floating_object, offset);
     FindNextLayoutOpportunity();
   }
 }