[css-align] Adapt self-alignment properties to the new baseline syntax

third_party/WebKit/Source/core/css/resolver/StyleBuilderConverter.cpp

Index: third_party/WebKit/Source/core/css/resolver/StyleBuilderConverter.cpp
diff --git a/third_party/WebKit/Source/core/css/resolver/StyleBuilderConverter.cpp b/third_party/WebKit/Source/core/css/resolver/StyleBuilderConverter.cpp
index 46e06da84bc3c03f5131df863e6d7b4ed7c55141..7fa81114dea7e15c52ce285e966fd4cabc73ea40 100644
--- a/third_party/WebKit/Source/core/css/resolver/StyleBuilderConverter.cpp
+++ b/third_party/WebKit/Source/core/css/resolver/StyleBuilderConverter.cpp
@@ -509,6 +509,12 @@ StyleSelfAlignmentData StyleBuilderConverter::convertSelfOrDefaultAlignmentData(
       alignmentData.setPositionType(LegacyPosition);
       alignmentData.setPosition(
           toCSSIdentifierValue(pair.second()).convertTo<ItemPosition>());
+    } else if (toCSSIdentifierValue(pair.first()).getValueID() ==
+               CSSValueFirst) {
+      alignmentData.setPosition(ItemPositionBaseline);
+    } else if (toCSSIdentifierValue(pair.first()).getValueID() ==
+               CSSValueLast) {
+      alignmentData.setPosition(ItemPositionLastBaseline);
     } else {
       alignmentData.setPosition(
           toCSSIdentifierValue(pair.first()).convertTo<ItemPosition>());