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

pkg/dev_compiler/lib/js/amd/dart_sdk.js

Index: pkg/dev_compiler/lib/js/amd/dart_sdk.js
diff --git a/pkg/dev_compiler/lib/js/amd/dart_sdk.js b/pkg/dev_compiler/lib/js/amd/dart_sdk.js
index 9ebee569f20a4427c3dcf3d0400900605a4c570f..6daca3e921f3fb7c307afbcff892eee2a820946b 100644
--- a/pkg/dev_compiler/lib/js/amd/dart_sdk.js
+++ b/pkg/dev_compiler/lib/js/amd/dart_sdk.js
@@ -2624,7 +2624,8 @@ define([], function() {
         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;
   })();
   dart.JsSymbol = Symbol;
   dart._mixins = Symbol("mixins");