dart2js: make "CREATE_JS_ISOLATE" an embedded global.

sdk/lib/_internal/compiler/js_lib/shared/embedded_names.dart

Index: sdk/lib/_internal/compiler/js_lib/shared/embedded_names.dart
diff --git a/sdk/lib/_internal/compiler/js_lib/shared/embedded_names.dart b/sdk/lib/_internal/compiler/js_lib/shared/embedded_names.dart
index aa899bdbe567f8b2e670f9f68c27cf4fc0b4faaf..9ae4f9fd5f668612c85f8804aa50a9e2940598a2 100644
--- a/sdk/lib/_internal/compiler/js_lib/shared/embedded_names.dart
+++ b/sdk/lib/_internal/compiler/js_lib/shared/embedded_names.dart
@@ -44,6 +44,13 @@ const INITIALIZE_LOADED_HUNK = 'initializeLoadedHunk';
 const IS_HUNK_LOADED = 'isHunkLoaded';
 const IS_HUNK_INITIALIZED = 'isHunkInitialized';
 const DEFERRED_INITIALIZED = 'deferredInitialized';
+
+/// Returns a function that creates a new Isolate (its static state).
+///
+/// (floitsch): Note that this will probably go away, since one JS heap will
+/// only contain one Dart isolate.
+const CREATE_NEW_ISOLATE = 'createNewIsolate';
+
 const CLASS_ID_EXTRACTOR = 'classIdExtractor';
 const CLASS_FIELDS_EXTRACTOR = 'classFieldsExtractor';
 const INSTANCE_FROM_CLASS_ID = "instanceFromClassId";