Releasing the former Stadia file transfer tools

The tools allow efficient and fast synchronization of large directory
trees from a Windows workstation to a Linux target machine.

cdc_rsync* support efficient copy of files by using content-defined
chunking (CDC) to identify chunks within files that can be reused.

asset_stream_manager + cdc_fuse_fs support efficient streaming of a
local directory to a remote virtual file system based on FUSE. It also
employs CDC to identify and reuse unchanged data chunks.

manifest/manifest_proto_defs.h

@@ -0,0 +1,52 @@
+/*
+ * Copyright 2022 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef MANIFEST_MANIFEST_PROTO_DEFS_H_
+#define MANIFEST_MANIFEST_PROTO_DEFS_H_
+
+#include "proto/manifest.pb.h"
+
+namespace cdc_ft {
+
+// Convenience typedefs to make the protos more easily accessible.
+using AssetListProto = proto::AssetList;
+using AssetProto = proto::Asset;
+using CdcParamsProto = proto::CdcParameters;
+using ChunkListProto = proto::ChunkList;
+using ChunkRefProto = proto::ChunkRef;
+using ContentIdProto = proto::ContentId;
+using IndirectChunkListProto = proto::IndirectChunkList;
+using ManifestProto = proto::Manifest;
+using RepeatedAssetProto = google::protobuf::RepeatedPtrField<AssetProto>;
+using RepeatedChunkRefProto = google::protobuf::RepeatedPtrField<ChunkRefProto>;
+using RepeatedContentIdProto =
+    google::protobuf::RepeatedPtrField<ContentIdProto>;
+using RepeatedIndirectChunkListProto =
+    google::protobuf::RepeatedPtrField<IndirectChunkListProto>;
+using RepeatedStringProto = google::protobuf::RepeatedPtrField<std::string>;
+
+namespace proto {
+
+inline bool operator==(const Asset& a, const Asset& b) {
+  return a.SerializeAsString() == b.SerializeAsString();
+}
+
+inline bool operator!=(const Asset& a, const Asset& b) { return !(a == b); }
+
+}  // namespace proto
+}  // namespace cdc_ft
+
+#endif  // MANIFEST_MANIFEST_PROTO_DEFS_H_