[Android][Sync] Sync passwords from Android to Desktop; fixes brave/b…

…rave-browser#43303

chromium_src/chrome/browser/password_manager/android/password_manager_android_util.cc

@@ -3,6 +3,9 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
  * You can obtain one at https://mozilla.org/MPL/2.0/. */
 
+#include "components/password_manager/core/common/password_manager_pref_names.h"
+#include "components/prefs/pref_service.h"
+
 #define SetUsesSplitStoresAndUPMForLocal \
   SetUsesSplitStoresAndUPMForLocal_ChromiumImpl
 
@@ -12,11 +15,42 @@
 
 namespace password_manager_android_util {
 
+namespace {
+
+// On Android passwords can be saved into two stores: kAccountStore and
+// kProfileStore. Account store is not synced through Chromium sync and supposed
+// to store passwords at Google Account. Profile store is the store which saves
+// passwords at profile and passwords are synced as before. Decision which store
+// to use is made at PasswordSaveManagerImpl::GetPasswordStoreForSavingImpl.
+// Finally, `kPasswordsUseUPMLocalAndSeparateStores` pref is checked.
+// The stack:
+//        features_util::CanCreateAccountStore
+//        features_util::internal::CanAccountStorageBeEnabled
+//        features_util::internal::IsUserEligibleForAccountStorage
+//        features_util::GetDefaultPasswordStore
+//        PasswordFeatureManagerImpl::GetDefaultPasswordStore
+//        PasswordSaveManagerImpl::AccountStoreIsDefault
+//        PasswordSaveManagerImpl::GetPasswordStoreForSavingImpl
+// There are two ways to make passwords be saved at the profile store and be
+// synced:
+//   1) override PasswordSaveManagerImpl::AccountStoreIsDefault
+//   2) set `kPasswordsUseUPMLocalAndSeparateStores` pref to `kOff`
+// Choosing option 2.
+void ForcePasswordsProfileStore(PrefService* pref_service) {
+  pref_service->SetInteger(
+      password_manager::prefs::kPasswordsUseUPMLocalAndSeparateStores,
+      static_cast<int>(UseUpmLocalAndSeparateStoresState::kOff));
+}
+
+}  // namespace
+
 // Prevent deleting passwords local DB during migration.
 // Happens at SetUsesSplitStoresAndUPMForLocal =>
 //      MaybeDeactivateSplitStoresAndLocalUpm =>
 //      MaybeDeleteLoginDataFiles
 void SetUsesSplitStoresAndUPMForLocal(
     PrefService* pref_service,
-    const base::FilePath& login_db_directory) {}
+    const base::FilePath& login_db_directory) {
+  ForcePasswordsProfileStore(pref_service);
+}
 }  // namespace password_manager_android_util