Partial support to IDBKey to Dart conversions.

Source/WebCore/bindings/dart/custom/DartIDBKeyCustom.cpp

Index: Source/WebCore/bindings/dart/custom/DartIDBKeyCustom.cpp
diff --git a/Source/WebCore/bindings/dart/custom/DartIDBKeyCustom.cpp b/Source/WebCore/bindings/dart/custom/DartIDBKeyCustom.cpp
index ceb0a89ed2cd268acf0f15905c5ff3fe0b5559d8..5b19b397f7d0b16fc4aa31eb16e184bdc415c4f2 100644
--- a/Source/WebCore/bindings/dart/custom/DartIDBKeyCustom.cpp
+++ b/Source/WebCore/bindings/dart/custom/DartIDBKeyCustom.cpp
@@ -62,10 +62,30 @@ PassRefPtr<IDBKey> DartIDBKey::toNative(Dart_Handle handle, Dart_Handle& excepti
     return IDBKey::createInvalid();
 }
 
-Dart_Handle DartIDBKey::toDart(IDBKey*)
+Dart_Handle DartIDBKey::toDart(IDBKey* key)
 {
-    DART_UNIMPLEMENTED();
-    return 0;
+    if (!key)
+        return Dart_Null();
+
+    switch (key->type()) {
+    case IDBKey::InvalidType:
+    case IDBKey::MinType:
+        ASSERT_NOT_REACHED();
+        return Dart_Null();
+    case IDBKey::NumberType:
+        return DartUtilities::doubleToDart(key->number());
+    case IDBKey::StringType:
+        return DartUtilities::stringToDart(key->string());
+    case IDBKey::DateType:
+        // FIXME: support Date.
+        return Dart_Null();
+    case IDBKey::ArrayType:
+        // FIXME: support Array.
+        return Dart_Null();
+    }
+
+    ASSERT_NOT_REACHED();
+    return Dart_Null();
 }
 
 }