Enable DDC output to run on v8/d8 using ES6 modules

pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/runtime.dart

Index: pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/runtime.dart
diff --git a/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/runtime.dart b/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/runtime.dart
index fb474012aadd30111dc8d51084aa5d281e653e44..eb3b1e00e52166115264f00587597d60e01aeafe 100644
--- a/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/runtime.dart
+++ b/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/runtime.dart
@@ -82,7 +82,10 @@ final global_ = JS('', '''
         window.SourceBufferList = new MediaSource().sourceBuffers.constructor;
       }
     }
-    return typeof window == "undefined" ? global : window;
+    var globalState = (typeof window != "undefined") ? window
+      : (typeof global != "undefined") ? global
+      : (typeof self != "undefined") ? self : {};
+    return globalState;
   }()
 ''');