Updating the samples page to reflect the examples that have been retired.

src/site/samples/tracker/example/packages/polymer/boot.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.
-
-/// Experimental bootstrap to initialize polymer applications. This library is
-/// not used by default, and may be replaced by Dart code in the near future.
-///
-/// This script contains logic to bootstrap polymer apps during development. It
-/// internally discovers Dart script tags through HTML imports, and constructs
-/// a new entrypoint for the application that is then launched in an isolate.
-///
-/// For each script tag found, we will load the corresponding Dart library and
-/// execute all methods annotated with `@initMethod` and register all classes
-/// labeled with `@CustomTag`. We keep track of the order of imports and execute
-/// initializers in the same order.
-///
-/// You can this experimental bootstrap logic by including the
-/// polymer_experimental.html import, instead of polymer.html:
-///
-///    <link rel="import" href="packages/polymer/polymer_experimental.html">
-///
-/// This bootstrap replaces `initPolymer` so Dart code might need to be changed
-/// too. If you loaded init.dart directly, you can remove it. But if you invoke
-/// initPolymer in your main, you should remove that call and change to use
-/// `@initMethod` instead. The current bootstrap doesn't support having Dart
-/// script tags in the main page, so you may need to move some code into an HTML
-/// import. For example, If you need to run some initialization code before any
-/// other code is executed, include an HTML import to an html file with a
-/// "application/dart" script tag that contains an initializer
-/// method with the body of your old main, and make sure this tag is placed
-/// above other html-imports that load the rest of the application.
-/// Initialization methods are executed in the order in which they are
-/// discovered in the HTML document.
-(function() {
-  // Only run in Dartium.
-  if (!navigator.dartEnabled &&
-      // TODO(sigmund): remove userAgent check once 1.6 rolls as stable.
-      // See: dartbug.com/18463
-      (navigator.userAgent.indexOf('(Dart)') === -1)) {
-    return;
-  }
-
-  // Extract a Dart import URL from a script tag, which is the 'src' attribute
-  // of the script tag, or a data-url with the script contents for inlined code.
-  function getScriptUrl(script) {
-    var url = script.src;
-    if (url) {
-      // Normalize package: urls
-      var index = url.indexOf('packages/');
-      if (index == 0 || (index > 0 && url[index - 1] == '/')) {
-        url = "package:" + url.slice(index + 9);
-      }
-      return url;
-    }
-
-    // TODO(sigmund): change back to application/dart: using application/json is
-    // wrong but it hides a warning in Dartium (dartbug.com/18000).
-    return "data:application/json;base64," + window.btoa(script.textContent);
-  }
-
-  // Creates a Dart program that imports [urls] and passes them to
-  // startPolymerInDevelopment, which in turn will invoke methods marked with
-  // @initMethod, and register any custom tag labeled with @CustomTag in those
-  // libraries.
-  function createMain(urls, mainUrl) {
-    var imports = Array(urls.length + 1);
-    for (var i = 0; i < urls.length; ++i) {
-      imports[i] = 'import "' + urls[i] + '" as i' + i + ';';
-    }
-    imports[urls.length] = 'import "package:polymer/src/mirror_loader.dart";';
-    var arg = urls.length == 0 ? '[]' :
-        ('[\n      "' + urls.join('",\n      "') + '"\n     ]');
-    return (imports.join('\n') +
-        '\n\nmain() {\n' +
-        '  startPolymerInDevelopment(' + arg + ');\n' +
-        '}\n');
-  }
-
-  function discoverScripts(content, state, importedDoc) {
-    if (!state) {
-      // internal state tracking documents we've visited, the resulting list of
-      // scripts, and any tags with the incorrect mime-type.
-      state = {seen: {}, scripts: [], badTags: []};
-    }
-    if (!content) return state;
-
-    // Note: we visit both script and link-imports together to ensure we
-    // preserve the order of the script tags as they are discovered.
-    var nodes = content.querySelectorAll('script,link[rel="import"]');
-    for (var i = 0; i < nodes.length; i++) {
-      var node = nodes[i];
-      if (node instanceof HTMLLinkElement) {
-        // TODO(jmesserly): figure out why ".import" fails in content_shell but
-        // works in Dartium.
-        if (node.import && node.import.href) node = node.import;
-
-        if (state.seen[node.href]) continue;
-        state.seen[node.href] = node;
-        discoverScripts(node.import, state, true);
-      } else if (node instanceof HTMLScriptElement) {
-        if (node.type != 'application/dart') continue;
-        if (importedDoc) {
-          state.scripts.push(getScriptUrl(node));
-        } else {
-          state.badTags.push(node);
-        }
-      }
-    }
-    return state;
-  }
-
-  // TODO(jmesserly): we're using this function because DOMContentLoaded can
-  // be fired too soon: https://www.w3.org/Bugs/Public/show_bug.cgi?id=23526
-  HTMLImports.whenReady(function() {
-    // Append a new script tag that initializes everything.
-    var newScript = document.createElement('script');
-    newScript.type = "application/dart";
-
-    var results = discoverScripts(document);
-    if (results.badTags.length > 0) {
-      console.warn('The experimental polymer boostrap does not support '
-        + 'having script tags in the main document. You can move the script '
-        + 'tag to an HTML import instead. Also make sure your script tag '
-        + 'doesn\'t have a main, but a top-level method marked with '
-        + '@initMethod instead');
-      for (var i = 0; i < results.badTags.length; i++) {
-        console.warn(results.badTags[i]);
-      }
-    }
-    newScript.textContent = createMain(results.scripts);
-    document.body.appendChild(newScript);
-  });
-})();