[Mac] Add option to reauthenticate the OS user before revealing passwords.

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index 122a693508f47584f6206d710d20e955787b1fcd..062b8d97ae2ccdfa8afa85acd09b854316b4a536 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -397,6 +397,11 @@ const char kDisableOmniboxAutoCompletionForIme[] =
 const char kDisablePasswordAutofillPublicSuffixDomainMatching[] =
     "disable-password-autofill-public-suffix-domain-matching";
 
+// Disable the setting to prompt the user for their OS account password before
+// revealing plaintext passwords in the password manager.
+const char kDisablePasswordManagerReauthentication[] =
+    "disable-password-manager-reauthentication";
+
 // Disable pop-up blocking.
 const char kDisablePopupBlocking[]          = "disable-popup-blocking";
 
@@ -556,6 +561,11 @@ const char kEnableAuthNegotiatePort[]       = "enable-auth-negotiate-port";
 const char kEnablePasswordAutofillPublicSuffixDomainMatching[] =
     "enable-password-autofill-public-suffix-domain-matching";
 
+// Enable the setting to prompt the user for their OS account password before
+// revealing plaintext passwords in the password manager.
+const char kEnablePasswordManagerReauthentication[] =
+    "enable-password-manager-reauthentication";
+
 // Enables the pre- and auto-login features. When a user signs in to sync, the
 // browser's cookie jar is pre-filled with GAIA cookies. When the user visits a
 // GAIA login page, an info bar can help the user login.