Add ScopedForbidReturn and its test

util/misc/scoped_forbid_return.cc

Index: util/misc/scoped_forbid_return.cc
diff --git a/util/misc/scoped_forbid_return.cc b/util/misc/scoped_forbid_return.cc
new file mode 100644
index 0000000000000000000000000000000000000000..f8de1da49dbf2cd7dd8667d9774ff348e5b69a13
--- /dev/null
+++ b/util/misc/scoped_forbid_return.cc
@@ -0,0 +1,27 @@
+// Copyright 2014 The Crashpad Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "util/misc/scoped_forbid_return.h"
+
+#include "base/logging.h"
+
+namespace crashpad {
+
+ScopedForbidReturn::~ScopedForbidReturn() {
+  if (armed_) {
+    LOG(FATAL) << "attempt to exit scope forbidden";
+  }
+}
+
+}  // namespace crashpad