[Font Load Events] Partial implementation of SetClass operations for FontFaceSet

LayoutTests/fast/css/fontfaceset-set-operations-expected.txt

Index: LayoutTests/fast/css/fontfaceset-set-operations-expected.txt
diff --git a/LayoutTests/fast/css/fontfaceset-set-operations-expected.txt b/LayoutTests/fast/css/fontfaceset-set-operations-expected.txt
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+Tests set operations of FontFaceSet.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+PASS document.fonts.size is 3
+PASS faces.length is 3
+PASS faces[0].family is "Font1"
+PASS faces[1].family is "Font2"
+PASS faces[2].family is "Font3"
+PASS document.fonts.has(faces[0]) is true
+PASS document.fonts.has(faces[1]) is true
+PASS document.fonts.has(faces[2]) is true
+PASS document.fonts.has(new FontFace("MyFont", "local(Arial)", {})) is false
+PASS document.fonts.has("Font1") threw exception TypeError: Failed to execute 'has' on 'FontFaceSet': The argument is not a FontFace..
+PASS successfullyParsed is true
+
+TEST COMPLETE
+