Add support for the object-fit CSS property.

LayoutTests/fast/css/parsing-object-fit-expected.txt

Index: LayoutTests/fast/css/parsing-object-fit-expected.txt
diff --git a/LayoutTests/fast/css/parsing-object-fit-expected.txt b/LayoutTests/fast/css/parsing-object-fit-expected.txt
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+This tests checks that all of the input values for object-fit parse correctly.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+PASS testComputedStyle(";") is "fill"
+PASS test("object-fit: inherit;") is "inherit"
+PASS test("object-fit: initial;") is "initial"
+PASS test("object-fit: fill;") is "fill"
+PASS test("object-fit: contain;") is "contain"
+PASS test("object-fit: cover;") is "cover"
+PASS test("object-fit: none;") is "none"
+PASS test("object-fit: scale-down;") is "scale-down"
+PASS test("object-fit: fill contain;") is null
+PASS test("object-fit: bananas;") is null
+PASS test("object-fit: 23px;") is null
+PASS test("object-fit: 20%;") is null
+PASS successfullyParsed is true
+
+TEST COMPLETE
+