Roll Observatory packages and add a roll script

packages/analyzer/lib/instrumentation/instrumentation.dart

 // Copyright (c) 2014, 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 instrumentation;
 
 import 'dart:convert';
 
 import 'package:analyzer/task/model.dart';
 
@@ skipping 132 matching lines @@
       _instrumentationServer
           .log(_join([TAG_FILE_READ, path, timeStamp, content]));
     }
   }
 
   /**
    * Log that a log entry that was written to the analysis engine's log. The log
    * entry has the given [level] and [message], and was created at the given
    * [time].
    */
-  void logLogEntry(String level, DateTime time, String message) {
+  void logLogEntry(String level, DateTime time, String message,
+      Object exception, StackTrace stackTrace) {
     if (_instrumentationServer != null) {
       String timeStamp =
           time == null ? 'null' : time.millisecondsSinceEpoch.toString();
-      _instrumentationServer
-          .log(_join([TAG_LOG_ENTRY, level, timeStamp, message]));
+      String exceptionText = exception.toString();
+      String stackTraceText = stackTrace.toString();
+      _instrumentationServer.log(_join([
+        TAG_LOG_ENTRY,
+        level,
+        timeStamp,
+        message,
+        exceptionText,
+        stackTraceText
+      ]));
     }
   }
 
   /**
    * Log that a notification has been sent to the client.
    */
   void logNotification(String notification) {
     _log(TAG_NOTIFICATION, notification);
   }
 
@@ skipping 194 matching lines @@
     }
   }
 
   @override
   void shutdown() {
     for (InstrumentationServer server in _servers) {
       server.shutdown();
     }
   }
 }