Linux sandbox: report TSYNC status in chrome://sandbox

content/common/sandbox_linux/sandbox_seccomp_bpf_linux.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 "content/common/sandbox_linux/sandbox_seccomp_bpf_linux.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <sys/socket.h>
 #include <sys/stat.h>
@@ skipping 241 matching lines @@
 }
 
 bool SandboxSeccompBPF::SupportsSandbox() {
 #if defined(USE_SECCOMP_BPF)
   return SandboxBPF::SupportsSeccompSandbox(
       SandboxBPF::SeccompLevel::SINGLE_THREADED);
 #endif
   return false;
 }
 
+bool SandboxSeccompBPF::SupportsSandboxWithTsync() {
+#if defined(USE_SECCOMP_BPF)
+  return SandboxBPF::SupportsSeccompSandbox(
+      SandboxBPF::SeccompLevel::MULTI_THREADED);
+#endif
+  return false;
+}
+
 bool SandboxSeccompBPF::StartSandbox(const std::string& process_type,
                                      base::ScopedFD proc_task_fd) {
 #if defined(USE_SECCOMP_BPF)
   const base::CommandLine& command_line =
       *base::CommandLine::ForCurrentProcess();
 
   if (IsSeccompBPFDesired() &&  // Global switches policy.
       ShouldEnableSeccompBPF(process_type) &&  // Process-specific policy.
       SupportsSandbox()) {
     // If the kernel supports the sandbox, and if the command line says we
@@ skipping 22 matching lines @@
 
 scoped_ptr<sandbox::bpf_dsl::Policy> SandboxSeccompBPF::GetBaselinePolicy() {
 #if defined(USE_SECCOMP_BPF)
   return scoped_ptr<sandbox::bpf_dsl::Policy>(new BaselinePolicy);
 #else
   return scoped_ptr<sandbox::bpf_dsl::Policy>();
 #endif  // defined(USE_SECCOMP_BPF)
 }
 
 }  // namespace content