Improve incremental compilation.

dart/site/try/src/compilation.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.
 
 library trydart.compilation;
 
 import 'dart:html' show
     Blob,
     Element,
     ErrorEvent,
@@ skipping 85 matching lines @@
   }
 
   void start() {
     if (!shouldStartCompilation()) {
       receivePort.close();
       return;
     }
     if (current != null) current.dispose();
     current = this;
     console.nodes.clear();
-    var options = ['--disable-type-inference'];
+    var options = [
+        '--analyze-main',
+        '--disable-type-inference',
+        '--incremental-support',
+        '--no-source-maps',
+    ];
     if (verboseCompiler) options.add('--verbose');
     if (minified) options.add('--minify');
     if (onlyAnalyze) options.add('--analyze-only');
     compilerPort.send([['options', options], receivePort.sendPort]);
     console.appendHtml('<i class="icon-spinner icon-spin"></i>');
     console.appendText(' Compiling Dart program...\n');
     outputFrame.style.display = 'none';
     receivePort.listen(onMessage);
     compilerPort.send([source, receivePort.sendPort]);
   }
@@ skipping 170 matching lines @@
   port.send(replyTo.sendPort);
   replyTo.listen((message) {
     List list = message as List;
     try {
       compile(list[0], list[1]);
     } catch (exception, stack) {
       port.send('$exception\n$stack');
     }
   });
 }