[LayoutNG] Support objects that are opaque to whitespace collapsing

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

 // 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.
 
 #include "core/layout/ng/inline/ng_inline_node.h"
 
 #include "core/layout/BidiRun.h"
 #include "core/layout/LayoutBlockFlow.h"
 #include "core/layout/LayoutObject.h"
 #include "core/layout/LayoutText.h"
@@ skipping 212 matching lines @@
   while (node) {
     if (node->IsText()) {
       builder->SetIsSVGText(node->IsSVGInlineText());
       builder->Append(ToLayoutText(node)->GetText(), node->Style(), node);
       node->ClearNeedsLayout();
 
     } else if (node->IsFloating()) {
       // Add floats and positioned objects in the same way as atomic inlines.
       // Because these objects need positions, they will be handled in
       // NGInlineLayoutAlgorithm.
-      builder->Append(NGInlineItem::kFloating, kObjectReplacementCharacter,
-                      nullptr, node);
+      builder->AppendOpaque(NGInlineItem::kFloating, nullptr, node);
 
     } else if (node->IsOutOfFlowPositioned()) {
-      builder->Append(NGInlineItem::kOutOfFlowPositioned,
-                      kObjectReplacementCharacter, nullptr, node);
+      builder->AppendOpaque(NGInlineItem::kOutOfFlowPositioned, nullptr, node);
 
     } else if (node->IsAtomicInlineLevel()) {
       // For atomic inlines add a unicode "object replacement character" to
       // signal the presence of a non-text object to the unicode bidi algorithm.
       builder->Append(NGInlineItem::kAtomicInline, kObjectReplacementCharacter,
                       node->Style(), node);
 
     } else if (!node->IsInline()) {
       // A block box found. End inline and transit to block layout.
       return node;
@@ skipping 277 matching lines @@
            item.Style() == item.GetLayoutObject()->Style());
   }
 #endif
 }
 
 String NGInlineNode::ToString() const {
   return String::Format("NGInlineNode");
 }
 
 }  // namespace blink