Add IsSandboxed() function to seatbelt wrapper.

sandbox/mac/sandbox_mac_compiler_unittest.mm

Index: sandbox/mac/sandbox_mac_compiler_unittest.mm
diff --git a/sandbox/mac/sandbox_mac_compiler_unittest.mm b/sandbox/mac/sandbox_mac_compiler_unittest.mm
index c04d89f97efea2f77a1336ff6c013ad3a42355f6..d011d0267031d04677934fd9ae9eb9ffec06f2a3 100644
--- a/sandbox/mac/sandbox_mac_compiler_unittest.mm
+++ b/sandbox/mac/sandbox_mac_compiler_unittest.mm
@@ -11,6 +11,7 @@
 #include "base/test/multiprocess_test.h"
 #include "base/test/test_timeouts.h"
 #include "sandbox/mac/sandbox_compiler.h"
+#include "sandbox/mac/seatbelt.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/multiprocess_func_list.h"
 
@@ -162,4 +163,27 @@ TEST_F(SandboxMacCompilerTest, ProfileFunctionalityTestError) {
   EXPECT_EQ(exit_code, 0);
 }
 
+MULTIPROCESS_TEST_MAIN(SandboxCheckTestProcess) {
+  CHECK_EQ(0, sandbox_check(getpid(), NULL, SANDBOX_FILTER_NONE));
+  std::string profile =
+      "(version 1)"
+      "(deny default (with no-log))";
+
+  SandboxCompiler compiler(profile);
+  std::string error;
+  CHECK(compiler.CompileAndApplyProfile(&error));
+  CHECK_EQ(1, sandbox_check(getpid(), NULL, SANDBOX_FILTER_NONE));
+
+  return 0;
+}
+
+TEST_F(SandboxMacCompilerTest, SandboxCheckTest) {
+  base::SpawnChildResult spawn_child = SpawnChild("SandboxCheckTestProcess");
+  ASSERT_TRUE(spawn_child.process.IsValid());
+  int exit_code = 42;
+  EXPECT_TRUE(spawn_child.process.WaitForExitWithTimeout(
+      TestTimeouts::action_max_timeout(), &exit_code));
+  EXPECT_EQ(exit_code, 0);
+}
+
 }  // namespace sandbox