Various mocks and tweaks to reduce cancels in Leg.

dart/frog/leg/lib/mock.dart

+// Copyright (c) 2012, 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.
+
+// Mocks of things that Leg cannot read directly.
+
+// TODO(ahe): Remove this file.
+
+interface Exception default ExceptionImplementation {
+  const Exception([var msg]);
+}
+class IndexOutOfRangeException implements Exception {}
+class IllegalAccessException implements Exception {}
+class ClosureArgumentMismatchException implements Exception {}
+class ObjectNotClosureException implements Exception {}
+class IllegalArgumentException implements Exception {}
+class OutOfMemoryException implements Exception {}
+class StackOverflowException implements Exception {}
+class BadNumberFormatException implements Exception {}
+class WrongArgumentCountException implements Exception {}
+class NullPointerException implements Exception {}
+class NoMoreElementsException implements Exception {}
+class EmptyQueueException implements Exception {}
+class UnsupportedOperationException implements Exception {}
+class NotImplementedException implements Exception {}
+class IllegalJSRegExpException implements Exception {}
+class IntegerDivisionByZeroException implements Exception {}
+
+class AssertionError {}
+class TypeError extends AssertionError {}
+class FallThroughError {}
+
+// TODO(ahe): VM specfic exception?
+class InternalError {}
+
+// TODO(ahe): VM specfic exception?
+class StaticResolutionException implements Exception {}
+
+class NoSuchMethodException implements Exception {
+  Object receiver;
+  String name;
+  List args;
+  NoSuchMethodException(Object this.receiver, String this.name, List this.args);
+  String toString() {
+    return "NoSuchMethodException - receiver: '$receiver'" +
+        "function name: '$name' arguments: [$args]";
+  }
+}
+
+class List<E> implements Iterable<E> {
+  factory List([int length]) => Primitives.newList(length);
+  factory List.from(Iterable<E> other) {
+    throw 'List.from is not implemented';
+  }
+}
+
+class Stopwatch {
+  double startMs;
+  double elapsedMs;
+
+  Stopwatch() {
+    elapsedMs = 0.0;
+  }
+
+  void start() {
+    if (startMs == null) {
+      startMs = Primitives.dateNow();
+    }
+  }
+
+  void stop() {
+    if (startMs == null) return;
+    elapsedMs += Primitives.dateNow() - startMs;
+    startMs = null;
+  }
+
+  void reset() {
+    elapsedMs = 0.0;
+    if (startMs == null) return;
+    startMs = Primitives.dateNow();
+  }
+
+  int elapsed() {
+    return elapsedInMs();
+  }
+
+  int elapsedInUs() {
+    return elapsedInMs() * 1000;
+  }
+
+  int elapsedInMs() {
+    if (startMs == null) {
+      return Primitives.mathFloor(elapsedMs);
+    } else {
+      return Primitives.mathFloor(elapsedMs + (Primitives.dateNow() - startMs));
+    }
+  }
+
+  int frequency() {
+    return 1000;
+  }
+}
+
+void assert(condition) {}