Add the flag for the experiment to change "incognito" to "private"

Bug: 865140
Change-Id: Id58e74ea8cda672252b5f6abce911ce7d849ee3e
Reviewed-on: https://chromium-review.googlesource.com/1142448
Commit-Queue: Jian Li <[email protected]>
Reviewed-by: Dmitry Titov <[email protected]>
Cr-Commit-Position: refs/heads/master@{#577223}
diff --git a/chrome/browser/about_flags.cc b/chrome/browser/about_flags.cc
index 6f9f268..8534bbc 100644
--- a/chrome/browser/about_flags.cc
+++ b/chrome/browser/about_flags.cc
@@ -4135,6 +4135,12 @@
      flag_descriptions::kEnableSyncUSSBookmarksDescription, kOsAll,
      FEATURE_VALUE_TYPE(switches::kSyncUSSBookmarks)},
 
+#if defined(OS_ANDROID)
+    {"incognito-strings", flag_descriptions::kIncognitoStringsName,
+     flag_descriptions::kIncognitoStringsDescription, kOsAndroid,
+     FEATURE_VALUE_TYPE(chrome::android::kIncognitoStrings)},
+#endif
+
     // NOTE: Adding a new flag requires adding a corresponding entry to enum
     // "LoginCustomFlags" in tools/metrics/histograms/enums.xml. See "Flag
     // Histograms" in tools/metrics/histograms/README.md (run the