mac: Add CrashpadClient::UseSystemDefaultHandler()

util/mach/mach_extensions.cc

Index: util/mach/mach_extensions.cc
diff --git a/util/mach/mach_extensions.cc b/util/mach/mach_extensions.cc
index a3e147cc3bee2b01d7f5c5fab6eb639f52dfa7f2..c2343c218085c5abe8b9d099c75c21cf698fb3ec 100644
--- a/util/mach/mach_extensions.cc
+++ b/util/mach/mach_extensions.cc
@@ -16,6 +16,7 @@
 
 #include <AvailabilityMacros.h>
 #include <pthread.h>
+#include <servers/bootstrap.h>
 
 #include "base/mac/mach_logging.h"
 #include "util/mac/mac_util.h"
@@ -96,4 +97,19 @@ exception_mask_t ExcMaskValid() {
   return kExcMaskValid_10_11;
 }
 
+base::mac::ScopedMachSendRight SystemCrashReporterHandler() {
+  const char kSystemCrashReporterServiceName[] = "com.apple.ReportCrash";
+  exception_handler_t system_crash_reporter_handler;
+  kern_return_t kr = bootstrap_look_up(bootstrap_port,
+                                       kSystemCrashReporterServiceName,
+                                       &system_crash_reporter_handler);
+  if (kr != BOOTSTRAP_SUCCESS) {
+    BOOTSTRAP_LOG(ERROR, kr) << "bootstrap_look_up "
+                             << kSystemCrashReporterServiceName;
+    system_crash_reporter_handler = MACH_PORT_NULL;
+  }
+
+  return base::mac::ScopedMachSendRight(system_crash_reporter_handler);
+}
+
 }  // namespace crashpad