Add a flag for the password manager force-saving experiment.

components/password_manager/core/common/password_manager_switches.cc

Index: components/password_manager/core/common/password_manager_switches.cc
diff --git a/components/password_manager/core/common/password_manager_switches.cc b/components/password_manager/core/common/password_manager_switches.cc
index f230891292873e7857a6e64b796a00c900b614ef..7c4f678aa1185920bcac709ab889185898797a47 100644
--- a/components/password_manager/core/common/password_manager_switches.cc
+++ b/components/password_manager/core/common/password_manager_switches.cc
@@ -58,6 +58,10 @@ const char kEnableManagerForSyncSignin[] = "enable-manager-for-sync-signin";
 // central.
 const char kEnablePasswordLink[] = "enable-password-link";
 
+// Enable a context menu item in the password field that allows the user
+// to manually enforce saving of their password.
+const char kEnablePasswordForceSaving[] = "enable-password-force-saving";
+
 }  // namespace switches
 
 }  // namespace password_manager