fixes #315, order of libraries in the HTML file

lib/src/compiler.dart

 // Copyright (c) 2015, 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.
 
 /// Command line tool to run the checker on a Dart program.
 library dev_compiler.src.compiler;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:math' as math;
@@ skipping 134 matching lines @@
     if (!_compiled.add(library)) return;
 
     if (!options.checkSdk && library.source.uri.scheme == 'dart') {
       if (_jsGen != null) _copyDartRuntime();
       return;
     }
 
     // TODO(jmesserly): in incremental mode, we can skip the transitive
     // compile of imports/exports.
     _compileLibrary(_dartCore); // implicit dart:core dependency
-    library.importedLibraries.forEach(_compileLibrary);
-    library.exportedLibraries.forEach(_compileLibrary);
+    for (var import in library.imports) _compileLibrary(import.importedLibrary);
+    for (var export in library.exports) _compileLibrary(export.exportedLibrary);
 
     var unitElements = [library.definingCompilationUnit]..addAll(library.parts);
     var units = <CompilationUnit>[];
 
     bool failureInLib = false;
     for (var element in unitElements) {
       var unit = context.resolveCompilationUnit(element.source, library);
       units.add(unit);
       failureInLib = logErrors(element.source) || failureInLib;
       checker.visitCompilationUnit(unit);
@@ skipping 91 matching lines @@
       } else {
         var file = path.join(outputDir, getModulePath(uri));
         df.append(html_codegen.libraryInclude(path.relative(file, from: from)));
       }
     }
 
     df.append(html_codegen.invokeMain(getModuleName(mainLib.source.uri)));
     return df;
   }
 
   void _collectLibraries(LibraryElement lib, LinkedHashSet<Uri> loaded) {

[Jennifer Messerly, 2015/09/15 00:32:59]

our own ordered hash set was not effective because .importedLibraries was
changing the order each time ...

     var uri = lib.source.uri;
     if (!loaded.add(uri)) return;
     _collectLibraries(_dartCore, loaded);
-    for (var l in lib.importedLibraries) _collectLibraries(l, loaded);
-    for (var l in lib.exportedLibraries) _collectLibraries(l, loaded);
+
+    for (var l in lib.imports) _collectLibraries(l.importedLibrary, loaded);
+    for (var l in lib.exports) _collectLibraries(l.exportedLibrary, loaded);
     // Move the item to the end of the list.
     loaded.remove(uri);
     loaded.add(uri);
   }
 }
 
 abstract class AbstractCompiler {
   final CompilerOptions options;
   final AnalysisContext context;
   final CodeChecker checker;
@@ skipping 170 matching lines @@
     '_rtti.js',
     '_classes.js',
     '_operations.js',
     'dart_runtime.js',
   ];
   files.addAll(corelibOrder.map((l) => l.replaceAll('.', '/') + '.js'));
   return files;
 }();
 
 final _log = new Logger('dev_compiler.src.compiler');