Fix CSP mode of the polymer compiler. Turns out that inline Javascript <script>

pkg/polymer/lib/src/build/import_inliner.dart

 // Copyright (c) 2013, 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.
 
 /// Transfomer that inlines polymer-element definitions from html imports.
 library polymer.src.build.import_inliner;
 
 import 'dart:async';
 import 'dart:convert';
 
@@ skipping 208 matching lines @@
     }).then((_) => changed);
   }
 
   /// Split inline scripts into their own files. We need to do this for dart2js
   /// to be able to compile them.
   ///
   /// This also validates that there weren't any duplicate scripts.
   bool _extractScripts(Document doc, {bool injectLibraryName: true}) {
     bool changed = false;
     for (var script in doc.querySelectorAll('script')) {
-      if (script.attributes['type'] != TYPE_DART) continue;
-
       var src = script.attributes['src'];
       if (src != null) continue;
 
+      var type = script.attributes['type'];
+      var isDart = type == TYPE_DART;
+
+      var shouldExtract = isDart ||
+          (options.contentSecurityPolicy && (type == null || type == TYPE_JS));
+      if (!shouldExtract) continue;
+
+      var extension =  isDart ? 'dart' : 'js';
       final filename = path.url.basename(docId.path);
       final count = inlineScriptCounter++;
       var code = script.text;
       // TODO(sigmund): ensure this path is unique (dartbug.com/12618).
-      script.attributes['src'] = src = '$filename.$count.dart';
+      script.attributes['src'] = src = '$filename.$count.$extension';
       script.text = '';
       changed = true;
 
-      var newId = docId.addExtension('.$count.dart');
-      if (injectLibraryName && !_hasLibraryDirective(code)) {
+      var newId = docId.addExtension('.$count.$extension');
+      if (isDart && injectLibraryName && !_hasLibraryDirective(code)) {
         var libName = _libraryNameFor(docId, count);
         code = "library $libName;\n$code";
       }
       extractedFiles.add(newId);
       transform.addOutput(new Asset.fromString(newId, code));
     }
     return changed;
   }
 }
 
@@ skipping 220 matching lines @@
 /// When inlining <link rel="stylesheet"> tags copy over all attributes to the
 /// style tag except these ones.
 const IGNORED_LINKED_STYLE_ATTRS =
     const ['charset', 'href', 'href-lang', 'rel', 'rev'];
 
 /// Global RegExp objects for validating generated library names.
 final INVALID_LIB_CHARS_REGEX = new RegExp('[^a-z0-9_]');
 final NUM_REGEX = new RegExp('[0-9]');
 
 _getSpan(SourceFile file, AstNode node) => file.span(node.offset, node.end);