Added Dartium changes onto 45.0.2454.104

LayoutTests/dart/inspector/deferred-import.dart

+import 'dart:collection';
+import 'dart:html';
+import 'deferred-import-library.dart' deferred as deferred_import;
+
+main() {
+  window.onMessage.listen(handleMessage);
+}
+
+handleMessage(event) {
+  if (event.data == 'fromJS') {
+    deferred_import.loadLibrary().then((_) {
+      querySelector("#sample_text_id").text =
+          'value = ${deferred_import.calculate()}';
+      window.postMessage('fromDart', '*');
+    });
+  }
+}