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

chrome/browser/profiles/file_path_verifier_win.cc

 // 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.
 
 #include "chrome/browser/profiles/file_path_verifier_win.h"
 
 #include <windows.h>
 
 #include "base/file_util.h"
 #include "base/files/file_path.h"
 #include "base/metrics/histogram.h"
+#include "chrome_elf/create_file/chrome_create_file.h"
 
 namespace {
 
 // This enum is used in UMA histograms and should never be re-ordered.
 enum FileVerificationResult {
   FILE_VERIFICATION_SUCCESS,
   FILE_VERIFICATION_FILE_NOT_FOUND,
   FILE_VERIFICATION_INTERNAL_ERROR,
   FILE_VERIFICATION_FAILED_UNKNOWN,
   FILE_VERIFICATION_FAILED_SAMEBASE,
   FILE_VERIFICATION_FAILED_SAMEDIR,
+  FILE_VERIFICATION_SUCCESS_REDIRECT,
+  FILE_VERIFICATION_FAILED_SAMEBASE_REDIRECT,
+  FILE_VERIFICATION_FAILED_SAMEDIR_REDIRECT,
   NUM_FILE_VERIFICATION_RESULTS
 };
 
 // Returns a FileVerificationResult based on the state of |file| on disk.
 FileVerificationResult VerifyFileAtPath(const base::FilePath& file) {
   FileVerificationResult file_verification_result =
       FILE_VERIFICATION_FAILED_UNKNOWN;
   base::FilePath normalized_path;
+  int redirect_count_before = ::GetRedirectCount();
   if (!base::NormalizeFilePath(file, &normalized_path)) {
     if (::GetLastError() == ERROR_FILE_NOT_FOUND)
       file_verification_result = FILE_VERIFICATION_FILE_NOT_FOUND;
     else
       file_verification_result = FILE_VERIFICATION_INTERNAL_ERROR;
   } else {
     internal::PathComparisonReason path_comparison_reason =
         internal::ComparePathsIgnoreCase(file, normalized_path);
+    // GetRedirectCount() tracks the number of CreateFile() calls that were
+    // redirected. If it has increased then the CreateFile() call made by
+    // base::NormalizeFilePath() was redirected.
+    bool was_redirected = ::GetRedirectCount() > redirect_count_before;
     switch (path_comparison_reason) {
       case internal::PATH_COMPARISON_EQUAL:
-        file_verification_result = FILE_VERIFICATION_SUCCESS;
+        file_verification_result = was_redirected ?
+            FILE_VERIFICATION_SUCCESS_REDIRECT : FILE_VERIFICATION_SUCCESS;
         break;
       case internal::PATH_COMPARISON_FAILED_SAMEBASE:
-        file_verification_result = FILE_VERIFICATION_FAILED_SAMEBASE;
+        file_verification_result = was_redirected ?
+            FILE_VERIFICATION_FAILED_SAMEBASE_REDIRECT :
+            FILE_VERIFICATION_FAILED_SAMEBASE;
         break;
       case internal::PATH_COMPARISON_FAILED_SAMEDIR:
-        file_verification_result = FILE_VERIFICATION_FAILED_SAMEDIR;
+        file_verification_result = was_redirected ?
+            FILE_VERIFICATION_FAILED_SAMEDIR_REDIRECT :
+            FILE_VERIFICATION_FAILED_SAMEDIR;
         break;
     }
   }
   return file_verification_result;
 }
 
 }  // namespace
 
 namespace internal {
 
@@ skipping 16 matching lines @@
 
 }  // namespace internal
 
 void VerifyPreferencesFile(const base::FilePath& pref_file_path) {
   FileVerificationResult file_verification_result =
       VerifyFileAtPath(pref_file_path);
   UMA_HISTOGRAM_ENUMERATION("Stability.FileAtPath.Preferences",
                             file_verification_result,
                             NUM_FILE_VERIFICATION_RESULTS);
 }