[css-grid] Implement fit-content track size

third_party/WebKit/LayoutTests/fast/css-grid-layout/grid-columns-rows-get-set.html

Index: third_party/WebKit/LayoutTests/fast/css-grid-layout/grid-columns-rows-get-set.html
diff --git a/third_party/WebKit/LayoutTests/fast/css-grid-layout/grid-columns-rows-get-set.html b/third_party/WebKit/LayoutTests/fast/css-grid-layout/grid-columns-rows-get-set.html
index 9ecd605588e01de273fd0e6c83f72a189273e67f..ab7647ea21238814177a431fe13c855ae6c17047 100644
--- a/third_party/WebKit/LayoutTests/fast/css-grid-layout/grid-columns-rows-get-set.html
+++ b/third_party/WebKit/LayoutTests/fast/css-grid-layout/grid-columns-rows-get-set.html
@@ -91,6 +91,10 @@
     grid-template-columns: minmax(auto, 20px);
     grid-template-rows: minmax(max-content, auto);
 }
+.gridWithFitContentFunction {
+    grid-template-columns: fit-content(30%);
+    grid-template-rows: fit-content(20px):
+}
 </style>
 <script src="../../resources/js-test.js"></script>
 </head>
@@ -130,6 +134,9 @@
 <div class="grid definite gridWithAutoInsideMinMax contentStart" id="gridWithAutoInsideMinMaxElement">
     <div class="gridItem"></div>
 </div>
+<div class="grid definite gridWithFitContentFunction contentStart" id="gridWithFitContentFunctionElement">
+    <div class="gridItem"></div>
+</div>
 <script src="resources/grid-definitions-parsing-utils.js"></script>
 <script src="resources/grid-columns-rows-get-set.js"></script>
 </body>