Implement Promise.fulfill, Promise.resolve and Promise.reject.

Source/core/dom/Promise.idl

Index: Source/core/dom/Promise.idl
diff --git a/Source/core/dom/Promise.idl b/Source/core/dom/Promise.idl
index 865b7390939a758cdeaeb7ab3d6b1775ea5ba37a..7dd0916f36e2ac7889d1752b2a5915092e7ce6ee 100644
--- a/Source/core/dom/Promise.idl
+++ b/Source/core/dom/Promise.idl
@@ -35,6 +35,10 @@
    [Custom] Promise then(optional any fulfillCallback, optional any rejectCallback);
    [Custom] Promise catch(optional any rejectCallback);
 
+   [Custom] static Promise fulfill(any value);
+   [Custom] static Promise resolve(any value);
+   [Custom] static Promise reject(any value);
+
    [Custom] static Promise any(value... values);
    [Custom] static Promise every(value... values);
    [Custom] static Promise some(value... values);