Properly handle synchronous errors in Chain.capture.

pkg/stack_trace/lib/src/chain.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 stack_trace.chain;
 
 import 'dart:async';
 import 'dart:collection';
 
 import 'frame.dart';
@@ skipping 72 matching lines @@
   /// If [callback] returns a value, it will be returned by [capture] as well.
   ///
   /// Currently, capturing stack chains doesn't work when using dart2js due to
   /// issues [15171] and [15105]. Stack chains reported on dart2js will contain
   /// only one trace.
   ///
   /// [15171]: https://code.google.com/p/dart/issues/detail?id=15171
   /// [15105]: https://code.google.com/p/dart/issues/detail?id=15105
   static capture(callback(), {ChainHandler onError}) {
     var spec = new StackZoneSpecification(onError);
-    return runZoned(callback, zoneSpecification: spec.toSpec(), zoneValues: {
+    return runZoned(() {
+      try {
+        return callback();
+      } catch (error, stackTrace) {
+        // TODO(nweiz): Don't special-case this when issue 19566 is fixed.
+        return Zone.current.handleUncaughtError(error, stackTrace);
+      }
+    }, zoneSpecification: spec.toSpec(), zoneValues: {
       #stack_trace.stack_zone.spec: spec
     });
   }
 
   /// Ensures that any errors emitted by [futureOrStream] have the correct stack
   /// chain information associated with them.
   ///
   /// For the most part an error thrown within a [capture] zone will have the
   /// correct stack chain automatically associated with it. However, there are
   /// some cases where exceptions won't be automatically detected: any [Future]
@@ skipping 103 matching lines @@
   }
 
   /// Converts [this] to a [Trace].
   ///
   /// The trace version of a chain is just the concatenation of all the traces
   /// in the chain.
   Trace toTrace() => new Trace(flatten(traces.map((trace) => trace.frames)));
 
   String toString() => traces.join(_GAP);
 }