mac: Add CrashpadClient::UseSystemDefaultHandler()

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,
@@ skipping 113 matching lines @@
     EXPECT_FALSE(exc_mask_valid & EXC_MASK_CORPSE_NOTIFY);
   }
 
   // Bit 0 should not be set.
   EXPECT_FALSE(ExcMaskValid() & 1);
 
   // There must be bits set in ExcMaskValid() that are not set in ExcMaskAll().
   EXPECT_TRUE(ExcMaskValid() & ~ExcMaskAll());
 }
 
+TEST(MachExtensions, SystemCrashReporterHandler) {
+  base::mac::ScopedMachSendRight
+      system_crash_reporter_handler(SystemCrashReporterHandler());
+  EXPECT_TRUE(system_crash_reporter_handler);
+}
+
 }  // namespace
 }  // namespace test
 }  // namespace crashpad