[Font Load Events] Implement FontFaceSet methods

LayoutTests/http/tests/webfont/fontloader-loading-attribute.html

Index: LayoutTests/http/tests/webfont/fontloader-loading-attribute.html
diff --git a/LayoutTests/http/tests/webfont/fontloader-loading-attribute.html b/LayoutTests/http/tests/webfont/fontloader-loading-attribute.html
index 6dca7b5896b9e17491c8978ec433b0a05a68f97b..7e1a62dc72d7d54ff52d098cf967178844106aef 100644
--- a/LayoutTests/http/tests/webfont/fontloader-loading-attribute.html
+++ b/LayoutTests/http/tests/webfont/fontloader-loading-attribute.html
@@ -8,25 +8,25 @@
   }
 </style>
 <script>
-description('Test for FontFaceSet.loading attribute');
+description('Test for FontFaceSet.status attribute');
 
 window.jsTestIsAsync = true;
 
 function runTests() {
-    shouldBe("document.fonts.checkFont('10px TestFont')", "false");
-    shouldBe("document.fonts.loading", "false");
-    document.fonts.loadFont({ font: '10px TestFont', onsuccess: onsuccess });
-    shouldBe("document.fonts.loading", "true");
+    shouldBeFalse("document.fonts.check('10px TestFont')");
+    shouldBeEqualToString("document.fonts.status", "loaded");
+    document.fonts.load('10px TestFont').then(onsuccess);
+    shouldBeEqualToString("document.fonts.status", "loading");
 }
 
 function onsuccess() {
-    shouldBe("document.fonts.checkFont('10px TestFont')", "true");
-    shouldBe("document.fonts.loading", "true");
-    document.fonts.notifyWhenFontsReady(onFontsReady);
+    shouldBeTrue("document.fonts.check('10px TestFont')");
+    shouldBeEqualToString("document.fonts.status", "loaded");
+    document.fonts.ready().then(onFontsReady);
 }
 
 function onFontsReady() {
-    shouldBe("document.fonts.loading", "false");
+    shouldBeEqualToString("document.fonts.status", "loaded");
     finishJSTest();
 }