Add exc_client_variants (UniversalRaiseException()) and its test

util/mach/mach_extensions_test.cc

+// 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/mach/mach_extensions.h"
+
+#include "base/mac/scoped_mach_port.h"
+#include "gtest/gtest.h"
+
+namespace {
+
+using namespace crashpad;
+
+TEST(MachExtensions, MachThreadSelf) {
+  base::mac::ScopedMachSendRight thread_self(mach_thread_self());
+  EXPECT_EQ(thread_self, MachThreadSelf());
+}
+
+}  // namespace