[CSS Grid Layout] Implementation of the grid-template shorthand.

Source/core/css/CSSComputedStyleDeclaration.cpp

Index: Source/core/css/CSSComputedStyleDeclaration.cpp
diff --git a/Source/core/css/CSSComputedStyleDeclaration.cpp b/Source/core/css/CSSComputedStyleDeclaration.cpp
index 5569c5a3104382c2b8d684bda03debfce1f85338..70673fcbe742898934886b5336adbec6f0681e5d 100644
--- a/Source/core/css/CSSComputedStyleDeclaration.cpp
+++ b/Source/core/css/CSSComputedStyleDeclaration.cpp
@@ -1968,6 +1968,9 @@ PassRefPtr<CSSValue> CSSComputedStyleDeclaration::getPropertyCSSValue(CSSPropert
         case CSSPropertyGridArea:
             return valuesForGridShorthand(gridAreaShorthand());
 
+        case CSSPropertyGridTemplate:
+            return valuesForGridShorthand(gridTemplateShorthand());
+
         case CSSPropertyGridTemplateAreas:
             if (!style->namedGridAreaRowCount()) {
                 ASSERT(!style->namedGridAreaColumnCount());