Implement 'grid-template' parsing

LayoutTests/fast/css-grid-layout/grid-template-get-set-expected.txt

Index: LayoutTests/fast/css-grid-layout/grid-template-get-set-expected.txt
diff --git a/LayoutTests/fast/css-grid-layout/grid-template-get-set-expected.txt b/LayoutTests/fast/css-grid-layout/grid-template-get-set-expected.txt
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index 0000000000000000000000000000000000000000..d251d3d603764049372689278741e050df10f750
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+++ b/LayoutTests/fast/css-grid-layout/grid-template-get-set-expected.txt
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+This test checks that grid-template is properly parsed.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+Test getting grid-template set through CSS.
+PASS window.getComputedStyle(gridWithDefaultTemplate).getPropertyValue('grid-template') is "none"
+PASS window.getComputedStyle(gridWithSingleStringTemplate).getPropertyValue('grid-template') is "'area'"
+PASS window.getComputedStyle(gridWithTwoColumnsTemplate).getPropertyValue('grid-template') is "'first second'"
+PASS window.getComputedStyle(gridWithTwoRowsTemplate).getPropertyValue('grid-template') is "'first' 'second'"
+PASS window.getComputedStyle(gridWithSpanningColumnsTemplate).getPropertyValue('grid-template') is "'span span'"
+PASS window.getComputedStyle(gridWithSpanningRowsDotTemplate).getPropertyValue('grid-template') is "'span' '.'"
+PASS window.getComputedStyle(gridWithDotColumn).getPropertyValue('grid-template') is "'header .' 'footer .'"
+Test grid-template: initial
+PASS window.getComputedStyle(element).getPropertyValue('grid-template') is "'foobar'"
+Test grid-template: inherit
+PASS window.getComputedStyle(parentElement).getPropertyValue('grid-template') is "'foo bar'"
+PASS window.getComputedStyle(element).getPropertyValue('grid-template') is "'foo bar'"
+Test invalid grid-template values.
+PASS window.getComputedStyle(element).getPropertyValue('grid-template') is "none"
+PASS window.getComputedStyle(element).getPropertyValue('grid-template') is "none"
+PASS window.getComputedStyle(element).getPropertyValue('grid-template') is "none"
+PASS window.getComputedStyle(element).getPropertyValue('grid-template') is "none"
+PASS window.getComputedStyle(element).getPropertyValue('grid-template') is "none"
+
+FIXME: We currently don't validate that the named grid areas are <indent>.
+FAIL window.getComputedStyle(element).getPropertyValue('grid-template') should be none. Was 'nav-up'.
+PASS successfullyParsed is true
+
+TEST COMPLETE
+