Fix deferred loading with multiple apps on same page.

sdk/lib/_internal/compiler/js_lib/js_helper.dart

Index: sdk/lib/_internal/compiler/js_lib/js_helper.dart
diff --git a/sdk/lib/_internal/compiler/js_lib/js_helper.dart b/sdk/lib/_internal/compiler/js_lib/js_helper.dart
index d2f38367b381e9d4d357e4e6a715f45953074e96..63a13931be7ac3c18a13c27912d7cba89619d9e0 100644
--- a/sdk/lib/_internal/compiler/js_lib/js_helper.dart
+++ b/sdk/lib/_internal/compiler/js_lib/js_helper.dart
@@ -15,6 +15,7 @@ import 'dart:_js_embedded_names' show
     DEFERRED_LIBRARY_HASHES,
     INITIALIZE_LOADED_HUNK,
     IS_HUNK_LOADED,
+    IS_HUNK_INITIALIZED,
     NATIVE_SUPERCLASS_TAG_NAME;
 
 import 'dart:collection';
@@ -3313,15 +3314,18 @@ Future<Null> loadDeferredLibrary(String loadId) {
   // The indices into `uris` and `hashes` that we want to load.
   List<int> indices = new List.generate(uris.length, (i) => i);
   var isHunkLoaded = JS_EMBEDDED_GLOBAL('', IS_HUNK_LOADED);
+  var isHunkInitialized = JS_EMBEDDED_GLOBAL('', IS_HUNK_INITIALIZED);
   // Filter away indices for hunks that have already been loaded.
   List<int> indicesToLoad = indices
       .where((int i) => !JS('bool','#(#)', isHunkLoaded, hashes[i]))
       .toList();
-  // Load the needed hunks.
+  List<int> indicesToInitialize = indices
+      .where((int i) => !JS('bool','#(#)', isHunkInitialized, hashes[i]))
+      .toList();  // Load the needed hunks.
   return Future.wait(indicesToLoad
       .map((int i) => _loadHunk(uris[i]))).then((_) {
     // Now all hunks have been loaded, we run the needed initializers.
-    for (int i in indicesToLoad) {
+    for (int i in indicesToInitialize) {
       var initializer = JS_EMBEDDED_GLOBAL('', INITIALIZE_LOADED_HUNK);
       JS('void', '#(#)', initializer, hashes[i]);
     }