JS backend: added tests which pass an extension lambda to native code and visa versa.

Added workarounds in some tests because Rhino wrongly implicitly converts first parameter of `Function.call` to `Object`. But it's contradicts to ES5 specification(par. 15.3.4.4).

(#KT-4238, #KT-4345) In progress

js/js.tests/test/org/jetbrains/k2js/test/semantics/NativeInteropTest.java

@@ -88,4 +88,12 @@ public final class NativeInteropTest extends SingleFileTranslationTest {
     public void testNativePropertyWithCustomName() throws Exception {
         checkFooBoxIsOk();
     }
+
+    public void testPassExtLambdaToNative() throws Exception {
+        checkFooBoxIsOk();
+    }
+
+    public void testPassExtLambdaFromNative() throws Exception {
+        checkFooBoxIsOk();
+    }
 }