Add mojo::edk::ClosePeerConnection.

mojo/edk/embedder/named_platform_handle_utils_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_handle_utils.h"
 
 #include <sddl.h>
 #include <windows.h>
 
 #include <memory>
@@ skipping 31 matching lines @@
   const DWORD kDesiredAccess = GENERIC_READ | GENERIC_WRITE;
   // The SECURITY_ANONYMOUS flag means that the server side cannot impersonate
   // the client.
   const DWORD kFlags =
       SECURITY_SQOS_PRESENT | SECURITY_ANONYMOUS | FILE_FLAG_OVERLAPPED;
   ScopedPlatformHandle handle(
       PlatformHandle(CreateFileW(pipe_name.c_str(), kDesiredAccess,
                                  0,  // No sharing.
                                  nullptr, OPEN_EXISTING, kFlags,
                                  nullptr)));  // No template file.
-  PCHECK(handle.is_valid());
+  // The server may have stopped accepting a connection between the
+  // WaitNamedPipe() and CreateFile(). If this occurs, an invalid handle is
+  // returned.
+  DPLOG_IF(ERROR, !handle.is_valid())
+      << "Named pipe " << named_handle.pipe_name()
+      << " could not be opened after WaitNamedPipe succeeded";
   return handle;
 }
 
 ScopedPlatformHandle CreateServerHandle(
     const NamedPlatformHandle& named_handle,
     const CreateServerHandleOptions& options) {
   if (!named_handle.is_valid())
     return ScopedPlatformHandle();
 
   PSECURITY_DESCRIPTOR security_desc = nullptr;
@@ skipping 18 matching lines @@
                        4096,  // Out buffer size.
                        4096,  // In buffer size.
                        5000,  // Timeout in milliseconds.
                        &security_attributes));
   handle.needs_connection = true;
   return ScopedPlatformHandle(handle);
 }
 
 }  // namespace edk
 }  // namespace mojo