Fix the stack trace when there are C++ frames in between dart frames.

tests/corelib/error_stack_trace1_test.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.
+
+import "package:expect/expect.dart";
+
+class A {
+  static a() => b();
+  static b() => c();
+  static c() => throw "abc";
+}
+
+class B {
+  static a() => b();
+  static b() => c();
+  static c() {
+    try {
+      A.a();
+    } catch (e) {
+      // This should produce a NoSuchMethodError.
+      var trace = e.stackTrace;
+    }
+  }
+}
+
+main() {
+  bool hasThrown = false;
+  try {
+    B.a();
+  } catch (e) {
+    hasThrown = true;
+    Expect.isTrue(e.stackTrace is StackTrace,

[Ivan Posva, 2013/08/12 21:17:39]

Expect.isTrue(e.stackTrace.toString.contains("B.b"));

[siva, 2013/08/12 23:46:56]

Modified the test case to check for patterns in the stack trace.

On 2013/08/12 21:17:39, Ivan Posva wrote:

+                  "$e doesn't have a non-null stack trace");
+  }
+  Expect.isTrue(hasThrown);
+}