Allow weird characters (like ?) to appear in devfs filenames.

sdk/lib/vmservice/devfs.dart

 // Copyright (c) 2016, 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.
 
 part of dart._vmservice;
 
 String _encodeDevFSDisabledError(Message message) {
   return encodeRpcError(
       message, kFeatureDisabled,
       details: "DevFS is not supported by this Dart implementation");
@@ skipping 19 matching lines @@
 
   Uri resolvePath(String path) {
     if (path.startsWith('/')) {
       path = path.substring(1);
     }
     if (path.isEmpty) {
       return null;
     }
     Uri pathUri;
     try {
-      pathUri = Uri.parse(path);
+      pathUri = new Uri.file(path);
     } on FormatException catch(e) {
       return null;
     }
+
+    try {
+      // Make sure that this pathUri can be converted to a file path.
+      pathUri.toFilePath();
+    } on UnsupportedError catch (e) {
+      return null;
+    }
+
     Uri resolvedUri = uri.resolveUri(pathUri);
     if (!resolvedUri.toString().startsWith(uri.toString())) {
       // Resolved uri must be within the filesystem's base uri.
       return null;
     }
     return resolvedUri;
   }
 
   Map toMap() {
     return {
@@ skipping 252 matching lines @@
       return encodeMissingParamError(message, 'fsName');
     }
     if (fsName is! String) {
       return encodeInvalidParamError(message, 'fsName');
     }
     var fs = _fsMap[fsName];
     if (fs == null) {
       return _encodeFileSystemDoesNotExistError(message, fsName);
     }
     var fileList = await listFiles(fs.uri);
+    // Remove any url-encoding in the filenames.
+    for (int i = 0; i < fileList.length; i++) {
+      fileList[i]['name'] = Uri.decodeFull(fileList[i]['name']);
+    }
     var result = { 'type': 'FSFileList', 'files': fileList };
     return encodeResult(message, result);
   }
 }