Modify fileAtPath stat to track if the call was redirected by chrome_elf.

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
index dac93af072dcd100b8b17cb7a3143dbceb055c9f..f9f15c356348155c3cccfcef47a203435a5e927a 100644
--- a/chrome_elf/create_file/chrome_create_file.h
+++ b/chrome_elf/create_file/chrome_create_file.h
@@ -20,6 +20,9 @@ extern "C" HANDLE WINAPI CreateFileWRedirect(
     DWORD flags_and_attributes,
     HANDLE template_file);
 
+// Returns the count of CreateFile calls redirected so far.
+extern "C" int GetRedirectCount();
+
 // Partial reimplementation of kernel32!CreateFile (very partial: only handles
 // reading and writing to files in the User Data directory).
 HANDLE CreateFileNTDLL(