[LayoutNG] Support objects that are opaque to whitespace collapsing

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

Index: third_party/WebKit/Source/core/layout/ng/inline/ng_inline_items_builder_test.cc
diff --git a/third_party/WebKit/Source/core/layout/ng/inline/ng_inline_items_builder_test.cc b/third_party/WebKit/Source/core/layout/ng/inline/ng_inline_items_builder_test.cc
index dac3a1292c250aea7eaedbb1cb1efebf5e7e4b75..49323cc0cb853ef8c2fdbaaab09d92f56200b328 100644
--- a/third_party/WebKit/Source/core/layout/ng/inline/ng_inline_items_builder_test.cc
+++ b/third_party/WebKit/Source/core/layout/ng/inline/ng_inline_items_builder_test.cc
@@ -220,6 +220,18 @@ TEST_F(NGInlineItemsBuilderTest, CollapseEastAsianWidth) {
          "when both sides are Wide.";
 }
 
+TEST_F(NGInlineItemsBuilderTest, OpaqueToSpaceCollapsing) {
+  NGInlineItemsBuilder builder(&items_);
+  builder.Append("Hello ", style_.Get());
+  builder.AppendOpaque(NGInlineItem::kBidiControl,
+                       kFirstStrongIsolateCharacter);
+  builder.Append(" ", style_.Get());
+  builder.AppendOpaque(NGInlineItem::kBidiControl,
+                       kFirstStrongIsolateCharacter);
+  builder.Append(" World", style_.Get());
+  EXPECT_EQ(String(u"Hello \u2068\u2068World"), builder.ToString());
+}
+
 TEST_F(NGInlineItemsBuilderTest, CollapseAroundReplacedElement) {
   NGInlineItemsBuilder builder(&items_);
   builder.Append("Hello ", style_.Get());