Introduce Promise mapping to the IDL generator

Source/bindings/v8/ScriptPromise.h

Index: Source/bindings/v8/ScriptPromise.h
diff --git a/Source/bindings/v8/ScriptString.h b/Source/bindings/v8/ScriptPromise.h
similarity index 72%
copy from Source/bindings/v8/ScriptString.h
copy to Source/bindings/v8/ScriptPromise.h
index 14467c7eb9feb0e4c7780ef86d013820b5f2174f..203c1f53aba6749af2d64f879a40bcd41678a913 100644
--- a/Source/bindings/v8/ScriptString.h
+++ b/Source/bindings/v8/ScriptPromise.h
@@ -28,24 +28,42 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef ScriptString_h
-#define ScriptString_h
+#ifndef ScriptPromise_h
+#define ScriptPromise_h
 
+#include "bindings/v8/ScopedPersistent.h"
 #include "bindings/v8/ScriptValue.h"
-#include "bindings/v8/V8Binding.h"
-#include "wtf/text/WTFString.h"
+#include "bindings/v8/V8ScriptRunner.h"
+#include <v8.h>
 
 namespace WebCore {
 
-class ScriptString : public ScriptValue {
+class ScriptPromise : public ScriptValue {
 public:
-    ScriptString() { }
-    explicit ScriptString(v8::Handle<v8::String> value) : ScriptValue(value) { }
+    ScriptPromise()
+        : ScriptValue()
+    {
+    }
 
-    ScriptString concatenateWith(const String&);
-    String flattenToString() const;
+    explicit ScriptPromise(ScriptValue promise)
+        : ScriptValue(promise)
+    {
+        ASSERT(!hasNoValue());
+    }
+
+    explicit ScriptPromise(v8::Handle<v8::Value> promise)
+        : ScriptValue(promise)
+    {
+        ASSERT(!hasNoValue());
+    }
+
+    bool isUndefinedOrNull() const
+    {
+        return isUndefined() || isNull();
+    }
 };
 
 } // namespace WebCore
 
-#endif // ScriptString_h
+
+#endif // ScriptPromise_h