Extract CreateInitProcessReaper() from the Zygote.

sandbox/linux/suid/client/setuid_sandbox_client.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <sys/types.h>
 #include <sys/wait.h>
 #include <unistd.h>
 
 #include "base/environment.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/posix/eintr_wrapper.h"
 #include "base/strings/string_number_conversions.h"
 
+#include "sandbox/linux/services/init_process_reaper.h"
 #include "sandbox/linux/suid/common/sandbox.h"
 #include "sandbox/linux/suid/common/suid_unsafe_environment_variables.h"
 #include "setuid_sandbox_client.h"
 
 namespace {
 
 // Set an environment variable that reflects the API version we expect from the
 // setuid sandbox. Old versions of the sandbox will ignore this.
 void SetSandboxAPIEnvironmentVariable(base::Environment* env) {
   env->SetVar(sandbox::kSandboxEnvironmentApiRequest,
@@ skipping 118 matching lines @@
     LOG(ERROR) << "Error code reply from chroot helper";
     return false;
   }
 
   // We now consider ourselves "fully sandboxed" as far as the
   // setuid sandbox is concerned.
   sandboxed_ = true;
   return true;
 }
 
+bool SetuidSandboxClient::CreateInitProcessReaper(
+    base::Closure* post_fork_parent_callback) {
+  return sandbox::CreateInitProcessReaper(post_fork_parent_callback);
+}
+
 bool SetuidSandboxClient::IsSuidSandboxUpToDate() const {
   return GetHelperApi(env_) == kSUIDSandboxApiNumber;
 }
 
 bool SetuidSandboxClient::IsSuidSandboxChild() const {
   return GetIPCDescriptor(env_) >= 0;
 }
 
 bool SetuidSandboxClient::IsInNewPIDNamespace() const {
   return env_->HasVar(kSandboxPIDNSEnvironmentVarName);
 }
 
 bool SetuidSandboxClient::IsInNewNETNamespace() const {
   return env_->HasVar(kSandboxNETNSEnvironmentVarName);
 }
 
 bool SetuidSandboxClient::IsSandboxed() const {
   return sandboxed_;
 }
 
 void SetuidSandboxClient::SetupLaunchEnvironment() {
   SaveSUIDUnsafeEnvironmentVariables(env_);
   SetSandboxAPIEnvironmentVariable(env_);
 }
 
 }  // namespace sandbox