[Passwords] Add base::Feature for Editing Passwords in Desktop Settings

This change adds a base::Feature for editing passwords in the Desktop
settings. This feature will be disabled by default until the Polymer
implementation is completed.

Bug: 377140
Change-Id: Iff7289f6dc0889c2ba3aee6c98899d4f21dfa3b4
Reviewed-on: https://chromium-review.googlesource.com/c/1458194Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#630079}

components/password_manager/core/common/password_manager_features.cc

@@ -14,6 +14,11 @@ namespace features {
 const base::Feature kAffiliationBasedMatching = {
     "AffiliationBasedMatching", base::FEATURE_ENABLED_BY_DEFAULT};
 
+// Enables the editing of passwords in chrome://settings/passwords, i.e. the
+// Desktop passwords settings page.
+const base::Feature kEditPasswordsInDesktopSettings = {
+    "EditPasswordsInDesktopSettings", base::FEATURE_DISABLED_BY_DEFAULT};
+
 // Recovers lost passwords on Mac by deleting the ones that cannot be decrypted
 // with the present encryption key from the Keychain.
 const base::Feature kDeleteCorruptedPasswords = {

components/password_manager/core/common/password_manager_features.h

@@ -18,6 +18,7 @@ namespace features {
 // alongside the definition of their values in the .cc file.
 
 extern const base::Feature kAffiliationBasedMatching;
+extern const base::Feature kEditPasswordsInDesktopSettings;
 extern const base::Feature kDeleteCorruptedPasswords;
 extern const base::Feature kHtmlBasedUsernameDetector;
 extern const base::Feature kPasswordGenerationRequirementsDomainOverrides;