diff -r 000000000000 -r 6474c204b198 ipc/chromium/src/base/platform_file_win.cc
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ipc/chromium/src/base/platform_file_win.cc	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,62 @@
+// Copyright (c) 2006-2008 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 "base/platform_file.h"
+
+#include "base/logging.h"
+
+namespace base {
+
+PlatformFile CreatePlatformFile(const std::wstring& name,
+                                int flags,
+                                bool* created) {
+  DWORD disposition = 0;
+
+  if (flags & PLATFORM_FILE_OPEN)
+    disposition = OPEN_EXISTING;
+
+  if (flags & PLATFORM_FILE_CREATE) {
+    DCHECK(!disposition);
+    disposition = CREATE_NEW;
+  }
+
+  if (flags & PLATFORM_FILE_OPEN_ALWAYS) {
+    DCHECK(!disposition);
+    disposition = OPEN_ALWAYS;
+  }
+
+  if (flags & PLATFORM_FILE_CREATE_ALWAYS) {
+    DCHECK(!disposition);
+    disposition = CREATE_ALWAYS;
+  }
+
+  if (!disposition) {
+    NOTREACHED();
+    return NULL;
+  }
+
+  DWORD access = (flags & PLATFORM_FILE_READ) ? GENERIC_READ : 0;
+  if (flags & PLATFORM_FILE_WRITE)
+    access |= GENERIC_WRITE;
+
+  DWORD sharing = (flags & PLATFORM_FILE_EXCLUSIVE_READ) ? 0 : FILE_SHARE_READ;
+  if (!(flags & PLATFORM_FILE_EXCLUSIVE_WRITE))
+    sharing |= FILE_SHARE_WRITE;
+
+  DWORD create_flags = 0;
+  if (flags & PLATFORM_FILE_ASYNC)
+    create_flags |= FILE_FLAG_OVERLAPPED;
+
+  HANDLE file = CreateFile(name.c_str(), access, sharing, NULL, disposition,
+                           create_flags, NULL);
+
+  if ((flags & PLATFORM_FILE_OPEN_ALWAYS) && created &&
+      INVALID_HANDLE_VALUE != file) {
+    *created = (ERROR_ALREADY_EXISTS != GetLastError());
+  }
+
+  return file;
+}
+
+}  // namespace disk_cache