Allow custom security descriptors when creating named pipes on Windows.

mojo/edk/embedder/named_platform_channel_pair_win.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_channel_pair.h"
 
 #include <windows.h>
 
 #include <memory>
 #include <string>
@@ skipping 17 matching lines @@
 const char kMojoNamedPlatformChannelPipeSwitch[] =
     "mojo-named-platform-channel-pipe";
 
 std::wstring GeneratePipeName() {
   return base::StringPrintf(L"%u.%u.%I64u", GetCurrentProcessId(),
                             GetCurrentThreadId(), base::RandUint64());
 }
 
 }  // namespace
 
-NamedPlatformChannelPair::NamedPlatformChannelPair()
+NamedPlatformChannelPair::NamedPlatformChannelPair(
+    const NamedPlatformChannelPair::Options& options)
     : pipe_handle_(GeneratePipeName()) {
-  server_handle_ = CreateServerHandle(pipe_handle_, true);
+  CreateServerHandleOptions server_handle_options;
+  server_handle_options.security_descriptor = options.security_descriptor;
+  server_handle_options.enforce_uniqueness = true;
+  server_handle_ = CreateServerHandle(pipe_handle_, server_handle_options);
   PCHECK(server_handle_.is_valid());
 }
 
 NamedPlatformChannelPair::~NamedPlatformChannelPair() {}
 
 ScopedPlatformHandle NamedPlatformChannelPair::PassServerHandle() {
   return std::move(server_handle_);
 }
 
 // static
@@ skipping 25 matching lines @@
       << command_line->GetSwitchValueNative(
           kMojoNamedPlatformChannelPipeSwitch);
   // (Any existing switch won't actually be removed from the command line, but
   // the last one appended takes precedence.)
   command_line->AppendSwitchNative(kMojoNamedPlatformChannelPipeSwitch,
                                    pipe_handle_.name);
 }
 
 }  // namespace edk
 }  // namespace mojo