[ABANDONED] Introduce Promise example implementation written in JavaScript.

Source/core/dom/Promise.js

Index: Source/core/dom/Promise.js
diff --git a/Source/core/platform/Task.h b/Source/core/dom/Promise.js
similarity index 74%
copy from Source/core/platform/Task.h
copy to Source/core/dom/Promise.js
index b9d2e46802aebf6391df4ec3dabb580d43b2483c..2d8a74e38bf4ec45c3c0b68b7187f7bccbb25c5d 100644
--- a/Source/core/platform/Task.h
+++ b/Source/core/dom/Promise.js
@@ -28,30 +28,34 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef Task_h
-#define Task_h
-
-#include "wtf/Functional.h"
-#include "public/platform/WebThread.h"
-
-namespace WebCore {
-
-class Task : public WebKit::WebThread::Task {
-public:
-    explicit Task(const Closure& closure)
-        : m_closure(closure)
+(function() {
+    function get(value)
     {
+        var old = this.value;
+        this.value = value;
+        return old;
     }
 
-    virtual void run() OVERRIDE
+    function getStatic(value)
     {
-        m_closure();
+        return new Promise(value);
     }
 
-private:
-    Closure m_closure;
-};
+    function concat(a, b)
+    {
+        // We must not use the method of |a|, since its prototype object can be modified.
+        return [].concat(a, b);
+    }
 
-} // namespace WebCore
+    function $Promise(value)
+    {
+        this.value = value;
+    }
 
-#endif // Task_h
+    $Promise.prototype = {
+        get: get
+    };
+    $Promise.getStatic = getStatic;
+    $Promise.concat = concat;
+    return $Promise;
+});