Merge the Sky Engine changes from the SkyDart branch

sky/tests/modules/imports-can-import.sky

Index: sky/tests/modules/imports-can-import.sky
diff --git a/sky/tests/modules/imports-can-import.sky b/sky/tests/modules/imports-can-import.sky
index 46fb39d9ee589af90f5f7d2f3e89f1cefba1b1a7..34483266cff2f9b814739c2c3db054b7fc653fd6 100644
--- a/sky/tests/modules/imports-can-import.sky
+++ b/sky/tests/modules/imports-can-import.sky
@@ -2,6 +2,10 @@
 <import src="resources/intermediate.sky" as="chocolate" />
 <div id="result">FAIL</div>
 <script>
-document.getElementById("result").textContent = JSON.stringify(chocolate);
+import "dart:sky";
+
+void main() {
+    document.getElementById("result").textContent = chocolate.message;
+}
 </script>
 </html>