Enable Try Dart to run on IE11.

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 15 matching lines @@
     makeOutputFrame;
 
 import 'ui.dart' show
     buildButton,
     interaction,
     outputDiv,
     outputFrame;
 
 import 'settings.dart' show
     alwaysRunInWorker,
+    alwaysRunInIframe,
+    communicateViaBlobs,
     incrementalCompilation,
     minified,
     onlyAnalyze,
     verboseCompiler;
 
 import 'iframe_error_handler.dart' show
     errorStream;
 
 /**
  * Scheme for recognizing files stored in memory.
@@ skipping 57 matching lines @@
         '--no-source-maps',
     ];
     if (verboseCompiler) options.add('--verbose');
     if (minified) options.add('--minify');
     if (onlyAnalyze) options.add('--analyze-only');
     if (incrementalCompilation.value) {
       options.addAll(['--incremental-support', '--disable-type-inference']);
     }
     interaction.compilationStarting();
     compilerPort.send([['options', options], receivePort.sendPort]);
+    compilerPort.send([['communicateViaBlobs', communicateViaBlobs],
+                       receivePort.sendPort]);
     receivePort.listen(onMessage);
     compilerPort.send([source, receivePort.sendPort]);
   }
 
   void dispose() {
     if (worker != null) worker.terminate();
     objectUrls.forEach(Url.revokeObjectUrl);
   }
 
   onMessage(message) {
@@ skipping 84 matching lines @@
       outputFrame = frame;
       errorStream(frame).listen(interaction.onIframeError);
     }
     void onError(String errorMessage) {
       interaction.consolePrintLine(errorMessage);
       console
           ..append(buildButton('Try in iframe', (_) => retryInIframe()))
           ..appendText('\n');
     }
     interaction.aboutToRun();
-    if (usesDartHtml && !alwaysRunInWorker) {
+    if (alwaysRunInIframe ||
+        usesDartHtml && !alwaysRunInWorker) {
       retryInIframe();
     } else {
       runInWorker(url, onError);
     }
   }
 
   void runInWorker(String url, void onError(String errorMessage)) {
     worker = new Worker(url)
         ..onMessage.listen((MessageEvent event) {
           interaction.consolePrintLine(event.data);
@@ skipping 27 matching lines @@
     if (seenMessages.add('$begin:$end: [$kind] $message')) {
       // Guard against duplicated messages.
       addDiagnostic(kind, message, begin, end);
     }
   }
 
   onCrash(data) {
     interaction.onCompilerCrash(data);
   }
 }