[mojo-edk] Fix lifetime management of rewritten Windows HANDLEs

mojo/edk/embedder/platform_handle.h

 // Copyright 2013 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.
 
 #ifndef MOJO_EDK_EMBEDDER_PLATFORM_HANDLE_H_
 #define MOJO_EDK_EMBEDDER_PLATFORM_HANDLE_H_
 
 #include "build/build_config.h"
 #include "mojo/edk/system/system_impl_export.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
+
+#include "base/process/process_handle.h"
 #elif defined(OS_MACOSX) && !defined(OS_IOS)
 #include <mach/mach.h>
 #endif
 
 namespace mojo {
 namespace edk {
 
 #if defined(OS_POSIX)
 struct MOJO_SYSTEM_IMPL_EXPORT PlatformHandle {
   PlatformHandle() {}
@@ skipping 28 matching lines @@
 
   int handle = -1;
 
 #if defined(OS_MACOSX) && !defined(OS_IOS)
   mach_port_t port = MACH_PORT_NULL;
 #endif
 };
 #elif defined(OS_WIN)
 struct MOJO_SYSTEM_IMPL_EXPORT PlatformHandle {
   PlatformHandle() : handle(INVALID_HANDLE_VALUE) {}
-  explicit PlatformHandle(HANDLE handle) : handle(handle) {}
+  explicit PlatformHandle(HANDLE handle)
+      : handle(handle), owning_process(base::GetCurrentProcessHandle()) {}
 
   void CloseIfNecessary();
 
   bool is_valid() const { return handle != INVALID_HANDLE_VALUE; }
 
   HANDLE handle;
+
+  // A Windows HANDLE may be duplicated to another process but not yet sent to
+  // that process. This tracks the handle's owning process.
+  base::ProcessHandle owning_process;
 };
 #else
 #error "Platform not yet supported."
 #endif
 
 }  // namespace edk
 }  // namespace mojo
 
 #endif  // MOJO_EDK_EMBEDDER_PLATFORM_HANDLE_H_