Allow custom security descriptors when creating named pipes on Windows.

mojo/edk/embedder/named_platform_handle_utils_posix.cc

 // Copyright 2016 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 "mojo/edk/embedder/named_platform_handle_utils.h"
 
 #include <errno.h>
 #include <sys/socket.h>
 #include <sys/un.h>
 #include <unistd.h>
@@ skipping 81 matching lines @@
   if (HANDLE_EINTR(connect(handle.get().handle,
                            reinterpret_cast<sockaddr*>(&unix_addr),
                            unix_addr_len)) < 0) {
     PLOG(ERROR) << "connect " << named_handle.name;
     return ScopedPlatformHandle();
   }
 
   return handle;
 }
 
-ScopedPlatformHandle CreateServerHandle(const NamedPlatformHandle& named_handle,
-                                        bool enforce_uniqueness) {
-  CHECK(!enforce_uniqueness);
+ScopedPlatformHandle CreateServerHandle(
+    const NamedPlatformHandle& named_handle,
+    const CreateServerHandleOptions& options) {
   if (!named_handle.is_valid())
     return ScopedPlatformHandle();
 
   // Make sure the path we need exists.
   base::FilePath socket_dir = base::FilePath(named_handle.name).DirName();
   if (!base::CreateDirectory(socket_dir)) {
     LOG(ERROR) << "Couldn't create directory: " << socket_dir.value();
     return ScopedPlatformHandle();
   }
 
@@ skipping 23 matching lines @@
   if (listen(handle.get().handle, SOMAXCONN) < 0) {
     PLOG(ERROR) << "listen " << named_handle.name;
     unlink(named_handle.name.c_str());
     return ScopedPlatformHandle();
   }
   return handle;
 }
 
 }  // namespace edk
 }  // namespace mojo