Use SNAPSHOT sync mode for LocalSync

chrome/browser/sync_file_system/syncable_file_system_util.cc

Index: chrome/browser/sync_file_system/syncable_file_system_util.cc
diff --git a/chrome/browser/sync_file_system/syncable_file_system_util.cc b/chrome/browser/sync_file_system/syncable_file_system_util.cc
index a6b25501fc065c0fb8dc0f8e009277146dee79cd..d4338e8dd730cda7f9f2b98dbcffca74ed460a91 100644
--- a/chrome/browser/sync_file_system/syncable_file_system_util.cc
+++ b/chrome/browser/sync_file_system/syncable_file_system_util.cc
@@ -28,6 +28,11 @@ const char kEnableSyncFSDirectoryOperation[] =
 const char kSyncableMountName[] = "syncfs";
 const char kSyncableMountNameForInternalSync[] = "syncfs-internal";
 
+const base::FilePath::CharType kSyncFileSystemDir[] =
+    FILE_PATH_LITERAL("Sync FileSystem");
+const base::FilePath::CharType kSyncFileSystemDirDev[] =
+    FILE_PATH_LITERAL("Sync FileSystem Dev");
+
 bool is_directory_operation_enabled = false;
 
 }  // namespace
@@ -107,6 +112,12 @@ bool IsSyncFSDirectoryOperationEnabled() {
           kEnableSyncFSDirectoryOperation);
 }
 
+base::FilePath GetSyncFileSystemDir(const base::FilePath& profile_base_dir) {
+  return profile_base_dir.Append(
+      IsSyncFSDirectoryOperationEnabled() ? kSyncFileSystemDirDev
+                                          : kSyncFileSystemDir);
+}
+
 ScopedEnableSyncFSDirectoryOperation::ScopedEnableSyncFSDirectoryOperation() {
   was_enabled_ = IsSyncFSDirectoryOperationEnabled();
   SetEnableSyncFSDirectoryOperation(true);