Updating custom elements polyfill to the latest github.com/dart-lang version

pkg/custom_element/lib/custom-elements.debug.js

Index: pkg/custom_element/lib/custom-elements.debug.js
diff --git a/pkg/custom_element/lib/custom-elements.debug.js b/pkg/custom_element/lib/custom-elements.debug.js
index be0a36032bbe1c5743357070633f9280a8a1d192..befb1a929029e8b6959a1443ccf3992c002922cb 100644
--- a/pkg/custom_element/lib/custom-elements.debug.js
+++ b/pkg/custom_element/lib/custom-elements.debug.js
@@ -131,8 +131,7 @@ if (typeof WeakMap !== 'undefined' && navigator.userAgent.indexOf('Firefox/') <
 } else {
   (function() {
     var defineProperty = Object.defineProperty;
-    var hasOwnProperty = Object.hasOwnProperty;
-    var counter = new Date().getTime() % 1e9;
+    var counter = Date.now() % 1e9;
 
     SideTable = function() {
       this.name = '__st' + (Math.random() * 1e9 >>> 0) + (counter++ + '__');
@@ -140,10 +139,16 @@ if (typeof WeakMap !== 'undefined' && navigator.userAgent.indexOf('Firefox/') <
 
     SideTable.prototype = {
       set: function(key, value) {
-        defineProperty(key, this.name, {value: value, writable: true});
+        var entry = key[this.name];
+        if (entry && entry[0] === key)
+          entry[1] = value;
+        else
+          defineProperty(key, this.name, {value: [key, value], writable: true});
       },
       get: function(key) {
-        return hasOwnProperty.call(key, this.name) ? key[this.name] : undefined;
+        var entry;
+        return (entry = key[this.name]) && entry[0] === key ?
+            entry[1] : undefined;
       },
       delete: function(key) {
         this.set(key, undefined);
@@ -700,15 +705,7 @@ if (!window.MutationObserver) {
 
 (function(scope){
 
-/*
-if (HTMLElement.prototype.webkitShadowRoot) {
-  Object.defineProperty(HTMLElement.prototype, 'shadowRoot', {
-    get: function() {
-      return this.webkitShadowRoot;
-    }
-  };
-}
-*/
+var logFlags = window.logFlags || {};
 
 // walk the subtree rooted at node, applying 'find(element, data)' function
 // to each element
@@ -812,7 +809,7 @@ function inserted(element) {
   // TODO(sjmiles): when logging, do work on all custom elements so we can
   // track behavior even when callbacks not defined
   //console.log('inserted: ', element.localName);
-  if (element.enteredDocumentCallback || (element.__upgraded__ && logFlags.dom)) {
+  if (element.enteredViewCallback || (element.__upgraded__ && logFlags.dom)) {
     logFlags.dom && console.group('inserted:', element.localName);
     if (inDocument(element)) {
       element.__inserted = (element.__inserted || 0) + 1;
@@ -824,9 +821,9 @@ function inserted(element) {
       if (element.__inserted > 1) {
         logFlags.dom && console.warn('inserted:', element.localName,
           'insert/remove count:', element.__inserted)
-      } else if (element.enteredDocumentCallback) {
+      } else if (element.enteredViewCallback) {
         logFlags.dom && console.log('inserted:', element.localName);
-        element.enteredDocumentCallback();
+        element.enteredViewCallback();
       }
     }
     logFlags.dom && console.groupEnd();
@@ -843,7 +840,7 @@ function removedNode(node) {
 function removed(element) {
   // TODO(sjmiles): temporary: do work on all custom elements so we can track
   // behavior even when callbacks not defined
-  if (element.leftDocumentCallback || (element.__upgraded__ && logFlags.dom)) {
+  if (element.leftViewCallback || (element.__upgraded__ && logFlags.dom)) {
     logFlags.dom && console.log('removed:', element.localName);
     if (!inDocument(element)) {
       element.__inserted = (element.__inserted || 0) - 1;
@@ -855,8 +852,8 @@ function removed(element) {
       if (element.__inserted < 0) {
         logFlags.dom && console.warn('removed:', element.localName,
             'insert/remove count:', element.__inserted)
-      } else if (element.leftDocumentCallback) {
-        element.leftDocumentCallback();
+      } else if (element.leftViewCallback) {
+        element.leftViewCallback();
       }
     }
   }
@@ -864,8 +861,10 @@ function removed(element) {
 
 function inDocument(element) {
   var p = element;
+  var doc = window.ShadowDOMPolyfill &&
+      window.ShadowDOMPolyfill.wrapIfNeeded(document) || document;
   while (p) {
-    if (p == element.ownerDocument) {
+    if (p == doc) {
       return true;
     }
     p = p.parentNode || p.host;
@@ -891,13 +890,6 @@ function watchRoot(root) {
   }
 }
 
-function watchAllShadows(node) {
-  watchShadow(node);
-  forSubtree(node, function(e) {
-    watchShadow(node);
-  });
-}
-
 function filter(inNode) {
   switch (inNode.localName) {
     case 'style':
@@ -933,11 +925,6 @@ function handler(mutations) {
         if (filter(n)) {
           return;
         }
-        // watch shadow-roots on nodes that have had them attached manually
-        // TODO(sjmiles): remove if createShadowRoot is overridden
-        // TODO(sjmiles): removed as an optimization, manual shadow roots
-        // must be watched explicitly
-        //watchAllShadows(n);
         // nodes added may need lifecycle management
         addedNode(n);
       });
@@ -981,8 +968,6 @@ function upgradeDocument(document) {
 // exports
 
 scope.watchShadow = watchShadow;
-scope.watchAllShadows = watchAllShadows;
-
 scope.upgradeAll = addedNode;
 scope.upgradeSubtree = addedSubtree;
 
@@ -1014,14 +999,11 @@ var flags = scope.flags;
 
 // native document.register?
 
-var hasNative = Boolean(document.webkitRegister || document.register);
+var hasNative = Boolean(document.register);
 var useNative = !flags.register && hasNative;
 
 if (useNative) {
 
-  // normalize
-  document.register = document.register || document.webkitRegister;
-
   // stub
   var nop = function() {};
 
@@ -1030,7 +1012,6 @@ if (useNative) {
   scope.upgradeElement = nop;
 
   scope.watchShadow = nop;
-  scope.watchAllShadows = nop;
   scope.upgrade = nop;
   scope.upgradeAll = nop;
   scope.upgradeSubtree = nop;
@@ -1091,7 +1072,7 @@ if (useNative) {
     if (name.indexOf('-') < 0) {
       // TODO(sjmiles): replace with more appropriate error (EricB can probably
       // offer guidance)
-      throw new Error('document.register: first argument `name` must contain a dash (\'-\'). Argument was \'' + String(name) + '\'.');
+      throw new Error('document.register: first argument (\'name\') must contain a dash (\'-\'). Argument provided was \'' + String(name) + '\'.');
     }
     // record name
     definition.name = name;
@@ -1162,11 +1143,11 @@ if (useNative) {
     // prototype for precise mixing in
     if (!Object.__proto__) {
       // default prototype
-      var native = HTMLElement.prototype;
+      var nativePrototype = HTMLElement.prototype;
       // work out prototype when using type-extension
       if (definition.is) {
         var inst = document.createElement(definition.tag);
-        native = Object.getPrototypeOf(inst);
+        nativePrototype = Object.getPrototypeOf(inst);
       }
       // ensure __proto__ reference is installed at each point on the prototype
       // chain.
@@ -1174,14 +1155,14 @@ if (useNative) {
       // of prototype swizzling. In this case, this generated __proto__ provides
       // limited support for prototype traversal.
       var proto = definition.prototype, ancestor;
-      while (proto && (proto !== native)) {
+      while (proto && (proto !== nativePrototype)) {
         var ancestor = Object.getPrototypeOf(proto);
         proto.__proto__ = ancestor;
         proto = ancestor;
       }
     }
     // cache this in case of mixin
-    definition.native = native;
+    definition.native = nativePrototype;
   }
 
   // SECTION 4
@@ -1289,7 +1270,7 @@ if (useNative) {
 
   function registerDefinition(name, definition) {
     if (registry[name]) {
-      throw new Error('a type with that name is already registered.');
+      throw new Error('Cannot register a tag more than once');
     }
     registry[name] = definition;
   }
@@ -1442,14 +1423,16 @@ CustomElements.parser = parser;
 (function(){
 
 // bootstrap parsing
-
 function bootstrap() {
-  // go async so call stack can unwind
-  setTimeout(function() {
-    // parse document
-    CustomElements.parser.parse(document);
-    // one more pass before register is 'live'
-    CustomElements.upgradeDocument(document);
+  // parse document
+  CustomElements.parser.parse(document);
+  // one more pass before register is 'live'
+  CustomElements.upgradeDocument(document);
+  // choose async
+  var async = window.Platform && Platform.endOfMicrotask ?
+    Platform.endOfMicrotask :
+    setTimeout;
+  async(function() {
     // set internal 'ready' flag, now document.register will trigger
     // synchronous upgrades
     CustomElements.ready = true;
@@ -1462,7 +1445,7 @@ function bootstrap() {
     document.body.dispatchEvent(
       new CustomEvent('WebComponentsReady', {bubbles: true})
     );
-  }, 0);
+  });
 }
 
 // CustomEvent shim for IE