Use Future for error handling

pkg/analysis_server/lib/src/analysis_server.dart

Index: pkg/analysis_server/lib/src/analysis_server.dart
diff --git a/pkg/analysis_server/lib/src/analysis_server.dart b/pkg/analysis_server/lib/src/analysis_server.dart
index 1c5e683eb1240fac54b9ae076ee9ee7067311a0a..90fca909b11d5cacd3aeaf0c624dce3a4fcb97fa 100644
--- a/pkg/analysis_server/lib/src/analysis_server.dart
+++ b/pkg/analysis_server/lib/src/analysis_server.dart
@@ -136,8 +136,8 @@ class AnalysisServer {
     if (contextWorkQueue.isEmpty) {
       running = false;
     } else {
-      Timer.run(() {
-        performTask();
+      new Future(performTask).catchError((exception, stackTrace) {

[devoncarew, 2014/02/18 17:15:21]

Does performTask() throw? I think that's the only way that the catchError
handler will be called.

[Brian Wilkerson, 2014/02/18 17:18:38]

Not if it's working as expected, but an exception could be thrown if there's a
bug in the code somewhere. I'd rather that an exception didn't crash the server,
and this is my understanding of how to prevent that.

+        AnalysisEngine.instance.logger.logError3(exception);
       });
     }
   }