Enable zygote manager by default.

base/process_util_unittest.cc

 // Copyright (c) 2009 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.
 
 #define _CRT_SECURE_NO_WARNINGS
 
 #include "base/command_line.h"
 #include "base/eintr_wrapper.h"
 #include "base/file_path.h"
 #include "base/multiprocess_test.h"
@@ skipping 252 matching lines @@
   EXPECT_FALSE(GetAppOutput(CommandLine(L"false"), &output));
 
   std::vector<std::string> argv;
   argv.push_back("/bin/echo");
   argv.push_back("-n");
   argv.push_back("foobar42");
   EXPECT_TRUE(GetAppOutput(CommandLine(argv), &output));
   EXPECT_STREQ("foobar42", output.c_str());
 }
 
+#if defined(OS_LINUX)
+TEST_F(ProcessUtilTest, GetParentProcessId) {
+  base::ProcessId ppid = GetParentProcessId(GetCurrentProcId());
+  EXPECT_EQ(ppid, getppid());
+}
+#endif
+
 #endif  // defined(OS_POSIX)
 
 }  // namespace base