Use an alternate mechanism for CreateFile calls in Chrome

chrome_elf/create_file/chrome_create_file.h

Index: chrome_elf/create_file/chrome_create_file.h
diff --git a/chrome_elf/create_file/chrome_create_file.h b/chrome_elf/create_file/chrome_create_file.h
new file mode 100644
index 0000000000000000000000000000000000000000..dac93af072dcd100b8b17cb7a3143dbceb055c9f
--- /dev/null
+++ b/chrome_elf/create_file/chrome_create_file.h
@@ -0,0 +1,38 @@
+// Copyright 2014 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 CHROME_ELF_CREATE_FILE_CHROME_CREATE_FILE_H_
+#define CHROME_ELF_CREATE_FILE_CHROME_CREATE_FILE_H_
+
+#include <windows.h>
+
+#include "chrome_elf/chrome_elf_types.h"
+
+// A CreateFileW replacement that will call NTCreateFile directly when the
+// criteria defined in ShouldBypass() are satisfied for |lp_file_name|.
+extern "C" HANDLE WINAPI CreateFileWRedirect(
+    LPCWSTR file_name,
+    DWORD desired_access,
+    DWORD share_mode,
+    LPSECURITY_ATTRIBUTES security_attributes,
+    DWORD creation_disposition,
+    DWORD flags_and_attributes,
+    HANDLE template_file);
+
+// Partial reimplementation of kernel32!CreateFile (very partial: only handles
+// reading and writing to files in the User Data directory).
+HANDLE CreateFileNTDLL(
+    LPCWSTR file_name,
+    DWORD desired_access,
+    DWORD share_mode,
+    LPSECURITY_ATTRIBUTES security_attributes,
+    DWORD creation_disposition,
+    DWORD flags_and_attributes,
+    HANDLE template_file);
+
+// Determines whether or not we should use our version of CreateFile, or the
+// system version (only uses ours if we're writing to the user data directory).
+bool ShouldBypass(LPCWSTR file_name);
+
+#endif  // CHROME_ELF_CREATE_FILE_CHROME_CREATE_FILE_H_