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

third_party/WebKit/Source/core/css/CSSValueKeywords.json5

 {
   // The mode argument is used to limit the keyword to be used only for certain
   // CSSParserModes. Values that have the prefix -internal- are only allowed by
   // CSSParserModes listed in allowInternalPropertyAndValue()
 
   parameters: {
     mode: {},
   },
 
   //
@@ skipping 515 matching lines @@
     "space-evenly",
     // stretch
     "unsafe",
     "safe",
 
     // align-items / align-self
     // flex-start
     // flex-end
     // center
     // baseline
+    // last baseline,
+    // first baseline,
     // stretch
 
     // justify-content
     // start
     // end
     // flex-start
     // flex-end
     // center
     // space-between
     // space-around
@@ skipping 429 matching lines @@
     "pan-up",
     "pan-down",
     "manipulation",
     "pinch-zoom",
 
     // justify-items / justify-self
     // auto
     // stretch
     // baseline
     "last-baseline",
+    "first",
+    "last",
     // center
     // start
     // end
     "self-start",
     "self-end",
     // flex-start
     // flex-end
     // left
     // right
     // unsafe
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     // shape
     // rect
     // round
 
     // color-gamut
     // srgb
     "p3",
     "rec2020",
   ],
 }