[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 2e981a97bfa8751ade7a0ed8b4bce83b4578a5f0..eb7df6da1cd9f41c8966541b002ab66fa635cd90 100644
--- a/Source/core/css/CSSComputedStyleDeclaration.cpp
+++ b/Source/core/css/CSSComputedStyleDeclaration.cpp
@@ -1977,7 +1977,8 @@ PassRefPtrWillBeRawPtr<CSSValue> CSSComputedStyleDeclaration::getPropertyCSSValu
             return valuesForGridShorthand(gridRowShorthand());
         case CSSPropertyGridArea:
             return valuesForGridShorthand(gridAreaShorthand());
-
+        case CSSPropertyGridTemplate:
+            return valuesForGridShorthand(gridTemplateShorthand());
         case CSSPropertyGridTemplateAreas:
             if (!style->namedGridAreaRowCount()) {
                 ASSERT(!style->namedGridAreaColumnCount());