[Android] Allow __NR_rt_tgsigqueueinfo under seccomp.

content/common/sandbox_linux/android/sandbox_bpf_base_policy_android.h

 // Copyright 2014 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.
 
 #ifndef CONTENT_COMMON_SANDBOX_LINUX_ANDROID_SANDBOX_BPF_BASE_POLICY_ANDROID_H_
 #define CONTENT_COMMON_SANDBOX_LINUX_ANDROID_SANDBOX_BPF_BASE_POLICY_ANDROID_H_
 
+#include <sys/types.h>
+
 #include "base/macros.h"
 #include "content/common/sandbox_linux/sandbox_bpf_base_policy_linux.h"
 
 namespace content {
 
 // This class builds on top of the generic Linux baseline policy to reduce
 // Linux kernel attack surface. It augments the list of allowed syscalls to
 // allow ones required by the Android runtime.
 class SandboxBPFBasePolicyAndroid : public SandboxBPFBasePolicy {
  public:
   SandboxBPFBasePolicyAndroid();
   ~SandboxBPFBasePolicyAndroid() override;
 
   // sandbox::SandboxBPFPolicy:
   sandbox::bpf_dsl::ResultExpr EvaluateSyscall(
       int system_call_number) const override;
 
  private:
+  const pid_t pid_;
+
   DISALLOW_COPY_AND_ASSIGN(SandboxBPFBasePolicyAndroid);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_SANDBOX_LINUX_ANDROID_SANDBOX_BPF_BASE_POLICY_ANDROID_H_