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.

absl_helper/BUILD

@@ -0,0 +1,12 @@
+package(default_visibility = ["//visibility:public"])
+
+cc_library(
+    name = "jedec_size_flag",
+    srcs = ["jedec_size_flag.cc"],
+    hdrs = ["jedec_size_flag.h"],
+    deps = [
+        "@com_google_absl//absl/flags:flag",
+        "@com_google_absl//absl/flags:marshalling",
+        "@com_google_absl//absl/strings",
+    ],
+)