added sync config stubs

location/nearby/sharing/lib/sync/BUILD

@@ -29,5 +29,6 @@ cc_library(
         "@com_google_absl//absl/status:statusor",
         "@com_google_absl//absl/strings",
         "@com_google_absl//absl/strings:string_view",
+        "@com_google_absl//absl/time",
     ],
 )

location/nearby/sharing/lib/sync/sync_manager.h

@@ -24,6 +24,7 @@
 #include "absl/status/statusor.h"
 #include "absl/strings/str_cat.h"
 #include "absl/strings/string_view.h"
+#include "absl/time/time.h"
 #include "internal/base/file_path.h"
 #include "location/nearby/sharing/lib/rpc/sharing_rpc_client.h"
 #include "location/nearby/sharing/lib/sync/sync_binding_prefs.pb.h"
@@ -83,12 +84,29 @@ class SyncManager {
     return GetSyncBinding(binding_id).has_value();
   }
 
+  bool HasSyncBindings() const {
+    if (preference_manager_ == nullptr) {
+      return false;
+    }
+    std::optional<sync::SyncBindingPrefs> prefs =
+        preference_manager_->GetSyncBindingValue();
+    return prefs.has_value() && prefs->sync_bindings_size() > 0;
+  }
+
   std::optional<sync::SyncConfigPrefs> GetSyncConfig(
       absl::string_view binding_id) const {
     static_cast<void>(binding_id);
     return std::nullopt;
   }
 
+  void SetSyncConfigBackupTime(absl::string_view binding_id, bool success,
+                               absl::Time backup_time) {
+    // Sync config persistence is unavailable in this compatibility build.
+    static_cast<void>(binding_id);
+    static_cast<void>(success);
+    static_cast<void>(backup_time);
+  }
+
   absl::StatusOr<FilePath> UpdateSyncBindingDestinationDirectory(
       absl::string_view binding_id, FilePath save_path) {
     if (preference_manager_ == nullptr) {
@@ -123,4 +141,3 @@ class SyncManager {
 }  // namespace nearby::sharing
 
 #endif  // LOCATION_NEARBY_SHARING_LIB_SYNC_SYNC_MANAGER_H_
-

sharing/linux/BUILD

@@ -114,6 +114,7 @@ cc_library(
         "//internal/platform/implementation/linux",
         "//location/nearby/sharing/lib/account:account_manager",
         "//location/nearby/sharing/lib/sync:sync_binding_prefs_cc_proto",
+        "//location/nearby/sharing/lib/sync:sync_config_prefs_cc_proto",
         "//sharing/internal/api:platform",
         "//sharing/internal/public:pref_names",
         "//sharing/proto:share_cc_proto",

sharing/linux/platform/linux_preference_manager.cc

@@ -28,6 +28,7 @@
 #include "absl/time/time.h"
 #include "internal/platform/implementation/platform.h"
 #include "location/nearby/sharing/lib/sync/sync_binding_prefs.pb.h"
+#include "location/nearby/sharing/lib/sync/sync_config_prefs.pb.h"
 #include "nlohmann/json.hpp"
 #include "sharing/internal/api/private_certificate_data.h"
 #include "sharing/internal/public/pref_names.h"
@@ -203,6 +204,13 @@ class LinuxPreferenceManager final : public PreferenceManager {
                 serialized);
     }
   }
+  void SetSyncConfigValue(
+      absl::string_view binding_id,
+      const nearby::sharing::sync::SyncConfigPrefs& value) override {
+    // Sync config persistence is unavailable in this compatibility build.
+    static_cast<void>(binding_id);
+    static_cast<void>(value);
+  }
 
   bool GetBoolean(absl::string_view key, bool default_value) const override {
     return storage_ != nullptr ? storage_->GetBoolean(key, default_value)
@@ -327,6 +335,14 @@ class LinuxPreferenceManager final : public PreferenceManager {
     }
     return value;
   }
+  std::optional<nearby::sharing::sync::SyncConfigPrefs> GetSyncConfigValue(
+      absl::string_view binding_id) const override {
+    static_cast<void>(binding_id);
+    return std::nullopt;
+  }
+  void RemoveSyncConfigPref(absl::string_view binding_id) override {
+    static_cast<void>(binding_id);
+  }
   void Remove(absl::string_view key) override {
     if (storage_ != nullptr) {
       storage_->Remove(key);
@@ -339,6 +355,7 @@ class LinuxPreferenceManager final : public PreferenceManager {
       NotifyPreferenceChanged(PrefNames::kBindingConfigPrefix);
     }
   }
+  void RemoveAllSyncConfigs() override {}
   void AddObserver(
       absl::string_view name,
       std::function<void(absl::string_view pref_name)> observer) override {