Implement 'grid-template' parsing

Source/core/rendering/style/StyleGridData.h

Index: Source/core/rendering/style/StyleGridData.h
diff --git a/Source/core/rendering/style/StyleGridData.h b/Source/core/rendering/style/StyleGridData.h
index 96f1ca5732c64d01dd48849be50e8ca6b31ba1b8..21d9b013241f9d9edc631d3a940b6449e70cf74a 100644
--- a/Source/core/rendering/style/StyleGridData.h
+++ b/Source/core/rendering/style/StyleGridData.h
@@ -26,6 +26,7 @@
 #ifndef StyleGridData_h
 #define StyleGridData_h
 
+#include "core/rendering/style/GridCoordinate.h"
 #include "core/rendering/style/GridTrackSize.h"
 #include "core/rendering/style/RenderStyleConstants.h"
 #include "wtf/PassRefPtr.h"
@@ -44,7 +45,7 @@ public:
 
     bool operator==(const StyleGridData& o) const
     {
-        return m_gridDefinitionColumns == o.m_gridDefinitionColumns && m_gridDefinitionRows == o.m_gridDefinitionRows && m_gridAutoFlow == o.m_gridAutoFlow && m_gridAutoRows == o.m_gridAutoRows && m_gridAutoColumns == o.m_gridAutoColumns && m_namedGridColumnLines == o.m_namedGridColumnLines && m_namedGridRowLines == o.m_namedGridRowLines;
+        return m_gridDefinitionColumns == o.m_gridDefinitionColumns && m_gridDefinitionRows == o.m_gridDefinitionRows && m_gridAutoFlow == o.m_gridAutoFlow && m_gridAutoRows == o.m_gridAutoRows && m_gridAutoColumns == o.m_gridAutoColumns && m_namedGridColumnLines == o.m_namedGridColumnLines && m_namedGridRowLines == o.m_namedGridRowLines && m_namedGridArea == o.m_namedGridArea && m_namedGridArea == o.m_namedGridArea && m_namedGridAreaRowCount == o.m_namedGridAreaRowCount && m_namedGridAreaColumnCount == o.m_namedGridAreaColumnCount;
     }
 
     bool operator!=(const StyleGridData& o) const
@@ -63,6 +64,12 @@ public:
     GridTrackSize m_gridAutoRows;
     GridTrackSize m_gridAutoColumns;
 
+    NamedGridAreaMap m_namedGridArea;
+    // Because m_namedGridArea doesn't store the unnamed grid areas, we need to keep track
+    // of the explicit grid size defined by both named and unnamed grid areas.
+    size_t m_namedGridAreaRowCount;
+    size_t m_namedGridAreaColumnCount;
+
 private:
     StyleGridData();
     StyleGridData(const StyleGridData&);