Fix for Animation and other polyfills

pkg/dev_compiler/lib/js/legacy/dart_sdk.js

Index: pkg/dev_compiler/lib/js/legacy/dart_sdk.js
diff --git a/pkg/dev_compiler/lib/js/legacy/dart_sdk.js b/pkg/dev_compiler/lib/js/legacy/dart_sdk.js
index 6991a90e99901f8fa11c397ac9a8b2854204a10d..c0c3f05d11cc203a607799e15680e01e43e668ce 100644
--- a/pkg/dev_compiler/lib/js/legacy/dart_sdk.js
+++ b/pkg/dev_compiler/lib/js/legacy/dart_sdk.js
@@ -2331,7 +2331,56 @@ dart_library.library('dart_sdk', null, /* Imports */[
   dart.copyProperties = function(to, from) {
     return dart.copyTheseProperties(to, from, dart.getOwnNamesAndSymbols(from));
   };
-  dart.global = typeof window == "undefined" ? global : window;
+  dart.global = (function() {
+    if (typeof NodeList !== "undefined") {
+      NodeList.prototype.get = function(i) {
+        return this[i];
+      };
+      NamedNodeMap.prototype.get = function(i) {
+        return this[i];
+      };
+      DOMTokenList.prototype.get = function(i) {
+        return this[i];
+      };
+      HTMLCollection.prototype.get = function(i) {
+        return this[i];
+      };
+      if (typeof PannerNode == "undefined") {
+        let audioContext;
+        if (typeof AudioContext == "undefined" && typeof webkitAudioContext != "undefined") {
+          audioContext = new webkitAudioContext();
+        } else {
+          audioContext = new AudioContext();
+          window.StereoPannerNode = audioContext.createStereoPanner().constructor;
+        }
+        window.PannerNode = audioContext.createPanner().constructor;
+      }
+      if (typeof AudioSourceNode == "undefined") {
+        window.AudioSourceNode = MediaElementAudioSourceNode.__proto__;
+      }
+      if (typeof FontFaceSet == "undefined") {
+        window.FontFaceSet = document.fonts.__proto__.constructor;
+      }
+      if (typeof MemoryInfo == "undefined") {
+        if (typeof window.performance.memory != "undefined") {
+          window.MemoryInfo = window.performance.memory.constructor;
+        }
+      }
+      if (typeof Geolocation == "undefined") {
+        navigator.geolocation.constructor;
+      }
+      if (typeof Animation == "undefined") {
+        let d = document.createElement('div');
+        if (typeof d.animate != "undefined") {
+          window.Animation = d.animate(d).constructor;
+        }
+      }
+      if (typeof SourceBufferList == "undefined") {
+        window.SourceBufferList = new MediaSource().sourceBuffers.constructor;
+      }
+    }
+    return typeof window == "undefined" ? global : window;
+  })();
   dart.JsSymbol = Symbol;
   dart._mixins = Symbol("mixins");
   dart.implements = Symbol("implements");