[CSS Grid Layout] Redefining grids inside media queries does not work

Source/core/css/resolver/StyleBuilderConverter.cpp

Index: Source/core/css/resolver/StyleBuilderConverter.cpp
diff --git a/Source/core/css/resolver/StyleBuilderConverter.cpp b/Source/core/css/resolver/StyleBuilderConverter.cpp
index dadc1ec303a7ca5137b07683f4f382574e585638..38cba6312aa13096ccbbc19e421417264429ac8d 100644
--- a/Source/core/css/resolver/StyleBuilderConverter.cpp
+++ b/Source/core/css/resolver/StyleBuilderConverter.cpp
@@ -481,6 +481,26 @@ bool StyleBuilderConverter::convertGridTrackList(CSSValue* value, Vector<GridTra
     return true;
 }
 
+void StyleBuilderConverter::convertOrderedNamedGridLinesMapToNamedGridLinesMap(const OrderedNamedGridLines& orderedNamedGridLines, NamedGridLinesMap& namedGridLines)
+{
+    ASSERT(namedGridLines.size() == 0);
+
+    if (orderedNamedGridLines.size() == 0)
+        return;
+
+    for (auto& orderedNamedGridLine : orderedNamedGridLines) {
+        for (auto& lineName : orderedNamedGridLine.value) {
+            NamedGridLinesMap::AddResult startResult = namedGridLines.add(lineName, Vector<size_t>());
+            startResult.storedValue->value.append(orderedNamedGridLine.key);
+        }
+    }
+
+    for (auto& namedGridLine : namedGridLines) {
+        Vector<size_t> gridLineIndexes = namedGridLine.value;
+        std::sort(gridLineIndexes.begin(), gridLineIndexes.end());

[Julien - ping for review, 2014/11/10 16:03:33]

We may know do 2 sorting as we generate the implicit named grid lines. We should
find a way to do only one per application. This is a nit though as I don't think
we will end up with a lot of tracks.

+    }
+}
+
 void StyleBuilderConverter::createImplicitNamedGridLinesFromGridArea(const NamedGridAreaMap& namedGridAreas, NamedGridLinesMap& namedGridLines, GridTrackSizingDirection direction)
 {
     for (const auto& namedGridAreaEntry : namedGridAreas) {