Add iterator support to FontFaceSet

LayoutTests/fast/css/fontfaceset-iterator-expected.txt

Index: LayoutTests/fast/css/fontfaceset-iterator-expected.txt
diff --git a/LayoutTests/fast/css/fontfaceset-iterator-expected.txt b/LayoutTests/fast/css/fontfaceset-iterator-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..19d9fa12fd1851f21b86e7b02c33393fb1383194
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+++ b/LayoutTests/fast/css/fontfaceset-iterator-expected.txt
@@ -0,0 +1,16 @@
+Tests iterators of FontFaceSet.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+PASS families.join(',') is "font1,font2,font3"
+PASS families.join(',') is "font1,font2,font3"
+PASS families.join(',') is "font1,font2,font3"
+PASS entry[0] === entry[1] is true
+PASS entry[0] === entry[1] is true
+PASS entry[0] === entry[1] is true
+PASS families.join(',') is "font1,font2,font3"
+PASS successfullyParsed is true
+
+TEST COMPLETE
+