[css-grid] Fix track sizing algo w/ size restrictions and intrinsic sizes

LayoutTests/fast/css-grid-layout/grid-element-change-columns-repaint.html

Index: LayoutTests/fast/css-grid-layout/grid-element-change-columns-repaint.html
diff --git a/LayoutTests/fast/css-grid-layout/grid-element-change-columns-repaint.html b/LayoutTests/fast/css-grid-layout/grid-element-change-columns-repaint.html
index 2b077aa396816a4d7787cf3eedf7a20a497c9f39..453c5de7a23021672c4bcf4ff801ddeb62d88d24 100644
--- a/LayoutTests/fast/css-grid-layout/grid-element-change-columns-repaint.html
+++ b/LayoutTests/fast/css-grid-layout/grid-element-change-columns-repaint.html
@@ -16,7 +16,7 @@ body {
 }
 
 .grid {
-    width: -webkit-fit-content;
+    width: -webkit-min-content;

[jfernandez, 2015/09/01 23:41:39]

Why this change ? Is it related to the issue we are trying to solve ?

[svillar, 2015/09/02 13:25:48]

Because without my patch, fit-content was behaving like min-content and the test
expects that behavior, i.e. tracks are now maximized to their limits.

     grid-template-rows: 50px;
     grid-template-columns: minmax(100px, 180px) 100px minmax(50px, 100px);
 }