Update sandbox/linux from upstream

sandbox/linux/bpf_dsl/test_trap_registry_unittest.cc

+// Copyright 2015 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 "sandbox/linux/bpf_dsl/test_trap_registry.h"
+
+#include <stddef.h>
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace sandbox {
+namespace bpf_dsl {
+namespace {
+
+intptr_t TestTrapFuncOne(const arch_seccomp_data& data, void* aux) {
+  return 1;
+}
+
+intptr_t TestTrapFuncTwo(const arch_seccomp_data& data, void* aux) {
+  return 2;
+}
+
+// Test that TestTrapRegistry correctly assigns trap IDs to trap handlers.
+TEST(TestTrapRegistry, TrapIDs) {
+  struct {
+    TrapRegistry::TrapFnc fnc;
+    const void* aux;
+  } funcs[] = {
+      {TestTrapFuncOne, nullptr},
+      {TestTrapFuncTwo, nullptr},
+      {TestTrapFuncOne, funcs},
+      {TestTrapFuncTwo, funcs},
+  };
+
+  TestTrapRegistry traps;
+
+  // Add traps twice to test that IDs are reused correctly.
+  for (int i = 0; i < 2; ++i) {
+    for (size_t j = 0; j < arraysize(funcs); ++j) {
+      // Trap IDs start at 1.
+      EXPECT_EQ(j + 1, traps.Add(funcs[j].fnc, funcs[j].aux, true));
+    }
+  }
+}
+
+}  // namespace
+}  // namespace bpf_dsl
+}  // namespace sandbox