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

LayoutTests/fast/css-grid-layout/resources/grid-template-shorthand-parsing-utils.js

+function testGridDefinitionsValues(element, columnsValue, rowsValue, areasValue, computedColumnsValue, computedRowsValue)
+{
+    window.element = element;
+    var elementID = element.id || "element";
+    shouldBeEqualToString("window.getComputedStyle(" + elementID + ", '').getPropertyValue('grid-template-columns')", computedColumnsValue || columnsValue);
+    shouldBeEqualToString("window.getComputedStyle(" + elementID + ", '').getPropertyValue('grid-template-rows')", computedRowsValue || rowsValue);
+    shouldBeEqualToString("window.getComputedStyle(" + elementID + ", '').getPropertyValue('grid-template-areas')", areasValue);
+}
+
+function testGridDefinitionsSetJSValues(shorthandValue, computedColumnsValue, computedRowsValue, computedAreasValue, jsColumnsValue, jsRowsValue, jsAreasValue)
+{
+    checkGridDefinitionsSetJSValues(true, shorthandValue, computedColumnsValue, computedRowsValue, computedAreasValue, jsColumnsValue, jsRowsValue, jsAreasValue);
+}
+
+function testNonGridDefinitionsSetJSValues(shorthandValue, computedColumnsValue, computedRowsValue, computedAreasValue, jsColumnsValue, jsRowsValue, jsAreasValue)
+{
+    checkGridDefinitionsSetJSValues(false, shorthandValue, computedColumnsValue, computedRowsValue, computedAreasValue, jsColumnsValue, jsRowsValue, jsAreasValue);
+}
+
+function checkGridDefinitionsSetJSValues(useGrid, shorthandValue, computedColumnsValue, computedRowsValue, computedAreasValue, jsColumnsValue, jsRowsValue, jsAreasValue)
+{
+    window.element = document.createElement("div");
+    document.body.appendChild(element);
+    if (useGrid) {
+        element.style.display = "grid";
+        element.style.width = "800px";
+        element.style.height = "600px";
+    }
+    element.style.font = "10px Ahem"; // Used to resolve em font consistently.
+    element.style.gridTemplate = shorthandValue;
+    shouldBeEqualToString("getComputedStyle(element, '').getPropertyValue('grid-template-columns')", computedColumnsValue);
+    shouldBeEqualToString("element.style.gridTemplateColumns", jsColumnsValue || computedColumnsValue);
+    shouldBeEqualToString("getComputedStyle(element, '').getPropertyValue('grid-template-rows')", computedRowsValue);
+    shouldBeEqualToString("element.style.gridTemplateRows", jsRowsValue || computedRowsValue);
+    shouldBeEqualToString("getComputedStyle(element, '').getPropertyValue('grid-template-areas')", computedAreasValue);
+    shouldBeEqualToString("element.style.gridTemplateAreas", jsAreasValue || computedAreasValue);
+    document.body.removeChild(element);
+}
+
+function testGridDefinitionsSetBadJSValues(shorthandValue)
+{
+    window.element = document.createElement("div");
+    document.body.appendChild(element);
+    element.style.gridTemplate = shorthandValue;
+    // We can't use testSetJSValues as element.style.gridTemplateRows returns "".
+    testGridDefinitionsValues(element, "none", "none", "none");
+    document.body.removeChild(element);
+}