[css-grid] Implementation of Baseline Self-Alignment

third_party/WebKit/LayoutTests/fast/css-grid-layout/resources/grid-alignment.css

 /* align-self */
 .alignSelfAuto { align-self: auto; }
 .alignSelfStretch { align-self: stretch; }
 .alignSelfStart { align-self: start; }
 .alignSelfEnd { align-self: end; }
 .alignSelfCenter { align-self: center; }
 .alignSelfRight { align-self: right; }
 .alignSelfLeft { align-self: left; }
 
 .alignSelfFlexStart { align-self: flex-start; }
@@ skipping 109 matching lines @@
 
 .itemsSelfStart {
     align-items: self-start;
     justify-items: self-start;
 }
 
 .itemsSelfEnd {
     align-items: self-end;
     justify-items: self-end;
 }
+.itemsBaseline {
+    align-items: baseline;
+    justify-items: baseline;
+}
 
 /* Both align-self and justify-self */
 .selfStretch {
     align-self: stretch;
     justify-self: stretch;
 }
 .selfStart {
     align-self: start;
     justify-self: start;
 }
@@ skipping 72 matching lines @@
 
 .contentSpaceEvenly {
     justify-content: space-evenly;
     align-content: space-evenly;
 }
 
 .contentStretch {
     justify-content: stretch;
     align-content: stretch;
 }