Add CRASHPAD_SIMULATE_CRASH() and supporting client code

client/simulate_crash.h

+// 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.
+
+#ifndef CRASHPAD_CLIENT_SIMULATE_CRASH_H_
+#define CRASHPAD_CLIENT_SIMULATE_CRASH_H_
+
+#include "build/build_config.h"
+
+#if defined(OS_MACOSX)
+#include "client/simulate_crash_mac.h"
+#endif
+
+#endif  // CRASHPAD_CLIENT_SIMULATE_CRASH_H_