Revert "Build Observatory with runtime"

runtime/bin/vmservice/observatory/deployed/web/packages/web_components/dart_support.js

+// Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+// Teaches dart2js about the wrapping that is done by the Shadow DOM polyfill.
+(function() {
+  var ShadowDOMPolyfill = window.ShadowDOMPolyfill;
+  if (!ShadowDOMPolyfill) return;
+
+  // TODO(sigmund): remove the userAgent check once 1.6 rolls as stable.
+  // See: dartbug.com/18463
+  if (navigator.dartEnabled || (navigator.userAgent.indexOf('(Dart)') !== -1)) {
+    console.error("ShadowDOMPolyfill polyfill was loaded in Dartium. This " +
+        "will not work. This indicates that Dartium's Chrome version is " +
+        "not compatible with this version of web_components.");
+  }
+
+  var needsConstructorFix = window.constructor === window.Window;
+
+  // TODO(jmesserly): we need to wrap document somehow (a dart:html hook?)
+
+  // dartNativeDispatchHooksTransformer is described on initHooks() in
+  // sdk/lib/_internal/lib/native_helper.dart.
+  if (typeof window.dartNativeDispatchHooksTransformer == 'undefined')
+    window.dartNativeDispatchHooksTransformer = [];
+
+  window.dartNativeDispatchHooksTransformer.push(function(hooks) {
+    var NodeList = ShadowDOMPolyfill.wrappers.NodeList;
+    var ShadowRoot = ShadowDOMPolyfill.wrappers.ShadowRoot;
+    var unwrapIfNeeded = ShadowDOMPolyfill.unwrapIfNeeded;
+    var originalGetTag = hooks.getTag;
+    hooks.getTag = function getTag(obj) {
+      // TODO(jmesserly): do we still need these?
+      if (obj instanceof NodeList) return 'NodeList';
+      if (obj instanceof ShadowRoot) return 'ShadowRoot';
+      if (MutationRecord && (obj instanceof MutationRecord))
+          return 'MutationRecord';
+      if (MutationObserver && (obj instanceof MutationObserver))
+          return 'MutationObserver';
+
+      // TODO(jmesserly): this prevents incorrect interaction between ShadowDOM
+      // and dart:html's <template> polyfill. Essentially, ShadowDOM is
+      // polyfilling native template, but our Dart polyfill fails to detect this
+      // because the unwrapped node is an HTMLUnknownElement, leading it to
+      // think the node has no content.
+      if (obj instanceof HTMLTemplateElement) return 'HTMLTemplateElement';
+
+      var unwrapped = unwrapIfNeeded(obj);
+      if (unwrapped && (needsConstructorFix || obj !== unwrapped)) {
+        // Fix up class names for Firefox, or if using the minified polyfill.
+        // dart2js prefers .constructor.name, but there are all kinds of cases
+        // where this will give the wrong answer.
+        var ctor = obj.constructor
+        if (ctor === unwrapped.constructor) {
+          var name = ctor._ShadowDOMPolyfill$cacheTag_;
+          if (!name) {
+            name = originalGetTag(unwrapped);
+            ctor._ShadowDOMPolyfill$cacheTag_ = name;
+          }
+          return name;
+        }
+
+        obj = unwrapped;
+      }
+      return originalGetTag(obj);
+    }
+  });
+})();