Various mocks and tweaks to reduce cancels in Leg.

dart/frog/leg/lib/mockimpl.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 classes and interfaces that Leg cannot read directly.
+
+// TODO(ahe): Remove this file.
+
+class JSSyntaxRegExp {}
+class StringBufferImpl {}
+class DateImplementation {}
+class ReceivePortFactory {}
+
+class StringBase {
+  static String createFromCharCodes(List<int> charCodes) {
+    throw "StringBase.createFromCharCodes is not implemented";
+  }
+
+  static String join(List<String> strings, String separator) {
+    throw "StringBase.join is not implemented";
+  }
+
+  static String concatAll(List<String> strings) {
+    throw "StringBase.concatAll is not implemented";
+  }
+}
+
+class MathNatives {
+  static int parseInt(String str) {
+    throw 'MathNatives.parseInt is not implemented';
+  }
+
+  static double parseDouble(String str) {
+    throw 'MathNatives.parseDouble is not implemented';
+  }
+
+  static double sqrt(num value) {
+    throw 'MathNatives.sqrt is not implemented';
+  }
+
+  static double sin(num value) {
+    throw 'MathNatives.sin is not implemented';
+  }
+
+  static double cos(num value) {
+    throw 'MathNatives.cos is not implemented';
+  }
+
+  static double tan(num value) {
+    throw 'MathNatives.tan is not implemented';
+  }
+
+  static double acos(num value) {
+    throw 'MathNatives.acos is not implemented';
+  }
+
+  static double asin(num value) {
+    throw 'MathNatives.asin is not implemented';
+  }
+
+  static double atan(num value) {
+    throw 'MathNatives.atan is not implemented';
+  }
+
+  static double atan2(num a, num b) {
+    throw 'MathNatives.atan2 is not implemented';
+  }
+
+  static double exp(num value) {
+    throw 'MathNatives.exp is not implemented';
+  }
+
+  static double log(num value) {
+    throw 'MathNatives.log is not implemented';
+  }
+
+  static num pow(num value, num exponent) {
+    throw 'MathNatives.pow is not implemented';
+  }
+
+  static double random() {
+    throw 'MathNatives.random is not implemented';
+  }
+}