[css-align] justfy-items accepts 'legacy' and drops support for 'auto'

The syntax of the 'justify-items' property accepts a new 'legacy' value,
replacing the 'auto' value which is now parsed as invalid.

w3c/csswg-drafts#1318

This change affects also to the 'place-items' shorthand, which doesn't
accept 'auto' and, for the time being, neither 'legacy'.

Link to the intent-to-ship-and-remove request:

https://groups.google.com/a/chromium.org/d/msgid/blink-dev/552753c1-9b2f-bb01-4fed-2ae621f2398e%40igalia.com?utm_medium=email&utm_source=footer

Bug: 726147, 726148
Change-Id: I219de66b813d350fe33f00a1d4369bed8e9a2350

css/css-align/content-distribution/place-content-shorthand-004.html

@@ -47,6 +47,12 @@
         checkInvalidValues("start auto")
     }, "Verify 'auto' values are invalid");
 
+    test(function() {
+        checkInvalidValues("self-start")
+        checkInvalidValues("center self-end")
+        checkInvalidValues("self-end start")
+    }, "Verify self-position values are invalid");
+
     test(function() {
         checkInvalidValues("")
     }, "Verify empty declaration is invalid");

css/css-align/default-alignment/parse-justify-items-002.html

@@ -19,39 +19,39 @@
 test(function() {
     element = document.createElement("div");
     document.body.appendChild(element);
-    checkValues(element, "justifyItems", "justify-items", "", "legacy");
+    checkValues(element, "justifyItems", "justify-items", "", "normal");
 }, "Test 'initial' value when nothing is specified");
 
 test(function() {
     container.style.display = "";
-    checkInitialValues(element, "justifyItems", "justify-items", "center", "legacy");
+    checkInitialValues(element, "justifyItems", "justify-items", "center", "normal");
 }, "Test justify-items: 'initial'");
 
 test(function() {
     container.style.display = "grid";
-    checkInitialValues(element, "justifyItems", "justify-items", "safe start", "legacy");
+    checkInitialValues(element, "justifyItems", "justify-items", "safe start", "normal");
 }, "Test grid items justify-items: 'initial'");
 
 test(function() {
     container.style.display = "flex";
-    checkInitialValues(element, "justifyItems", "justify-items", "unsafe end", "legacy");
+    checkInitialValues(element, "justifyItems", "justify-items", "unsafe end", "normal");
 }, "Test flex items justify-items: 'initial'");
 
 test(function() {
     container.style.display = "";
     element.style.position = "absolute";
-    checkInitialValues(element, "justifyItems", "justify-items", "start", "legacy");
+    checkInitialValues(element, "justifyItems", "justify-items", "start", "normal");
 }, "Test absolute positioned elements justify-items: 'initial'");
 
 test(function() {
     container.style.display = "grid";
     element.style.position = "absolute";
-    checkInitialValues(element, "justifyItems", "justify-items", "end", "legacy");
+    checkInitialValues(element, "justifyItems", "justify-items", "end", "normal");
 }, "Test absolute positioned grid items justify-items: 'initial'");
 
 test(function() {
     container.style.display = "flex";
     element.style.position = "absolute";
-    checkInitialValues(element, "justifyItems", "justify-items", "end", "legacy");
+    checkInitialValues(element, "justifyItems", "justify-items", "end", "normal");
 }, "Test absolute positioned flex items justify-items: 'initial'");
 </script>

css/css-align/default-alignment/place-items-shorthand-004.html

@@ -37,7 +37,18 @@
        checkInvalidValues("auto")
        checkInvalidValues("auto right")
        checkInvalidValues("auto auto")
-    }, "Verify 'auto' value is invalid as first longhand value.");
+       checkInvalidValues("center auto")
+    }, "Verify 'auto' value is invalid.");
+
+    test(function() {
+       checkInvalidValues("legacy")
+       checkInvalidValues("legacy start")
+       checkInvalidValues("end legacy")
+       checkInvalidValues("legacy left")
+       checkInvalidValues("center legacy")
+       checkInvalidValues("start legacy center")
+    }, "Verify 'legacy' value is invalid.");
+
 
     test(function() {
         checkInvalidValues("")