[css-grid] Implement repeat(auto-fit)

third_party/WebKit/LayoutTests/fast/css-grid-layout/grid-element-auto-repeat-get-set.html

Index: third_party/WebKit/LayoutTests/fast/css-grid-layout/grid-element-auto-repeat-get-set.html
diff --git a/third_party/WebKit/LayoutTests/fast/css-grid-layout/grid-element-auto-repeat-get-set.html b/third_party/WebKit/LayoutTests/fast/css-grid-layout/grid-element-auto-repeat-get-set.html
index 801cfc082deb4f047f569527fe18ba9c3b5ce013..878581af927c0404189413ffcfd8e514c0568f66 100644
--- a/third_party/WebKit/LayoutTests/fast/css-grid-layout/grid-element-auto-repeat-get-set.html
+++ b/third_party/WebKit/LayoutTests/fast/css-grid-layout/grid-element-auto-repeat-get-set.html
@@ -18,6 +18,8 @@ body { font-size: 10px; }
     testGridDefinitionsSetJSValues("repeat(auto-fit, [foo bar] 150px)", "repeat(auto-fit, 24em [foo bar])", "none", "none");
     testGridDefinitionsSetJSValues("repeat(auto-fit, [foo bar] minmax(270px, 1fr))", "repeat(auto-fit, [foo] minmax(20em, max-content) [bar])", "none", "none");
     testGridDefinitionsSetJSValues("repeat(auto-fit, minmax(300px, min-content)) repeat(2, 20px)", "repeat(1, 10%) repeat(auto-fit, minmax(30em, max-content) [bar]) repeat(2, [foo] 1em)", "20px 20px", "60px [foo] 10px [foo] 10px", "repeat(auto-fit, minmax(300px, min-content)) 20px 20px", "10% repeat(auto-fit, minmax(30em, max-content) [bar]) [foo] 1em [foo] 1em");
+    testGridDefinitionsSetJSValues("[a] repeat(auto-fit, [z] 10px [y]) [b] 30px [c d] 20px [e]", "repeat(auto-fit, [z] 10px [y]) [a b] 30px [c d] 20px [e]", "[a b] 30px [c d] 20px [e]", "[a b] 30px [c d] 20px [e]");
+    testGridDefinitionsSetJSValues("[a] repeat(auto-fit, [z] 10px [y]) repeat(1, [b] 30px [c]) 20px [e]", "[a b] 30px [c d] 20px [e] repeat(auto-fit, [z] 10px [y])", "[a b] 30px [c] 20px [e]", "[a b] 30px [c d] 20px [e]", "[a] repeat(auto-fit, [z] 10px [y]) [b] 30px [c] 20px [e]");
 
     debug("");
     debug("Test invalid repeat syntax.");