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.

data_store/BUILD

@@ -0,0 +1,128 @@
+package(default_visibility = ["//:__subpackages__"])
+
+cc_library(
+    name = "data_store",
+    srcs = [
+        "data_store_reader.cc",
+        "data_store_writer.cc",
+    ],
+    hdrs = [
+        "data_store_reader.h",
+        "data_store_writer.h",
+    ],
+    deps = [
+        "//common:buffer",
+        "//common:status",
+        "//common:status_macros",
+        "//manifest:content_id",
+        "@com_google_absl//absl/status",
+        "@com_google_absl//absl/status:statusor",
+        "@com_google_absl//absl/strings:str_format",
+    ],
+)
+
+cc_library(
+    name = "data_provider",
+    srcs = ["data_provider.cc"],
+    hdrs = ["data_provider.h"],
+    deps = [
+        ":data_store",
+        "//common:clock",
+        "//common:log",
+        "//common:status",
+        "//common:stopwatch",
+        "@com_google_absl//absl/status",
+        "@com_google_absl//absl/strings",
+        "@com_google_absl//absl/strings:str_format",
+        "@com_google_absl//absl/synchronization",
+    ],
+)
+
+cc_library(
+    name = "disk_data_store",
+    srcs = ["disk_data_store.cc"],
+    hdrs = ["disk_data_store.h"],
+    deps = [
+        ":data_store",
+        "//common:clock",
+        "//common:log",
+        "//common:path",
+        "//common:platform",
+        "//common:status_macros",
+        "//manifest:content_id",
+        "@com_google_absl//absl/status",
+        "@com_google_absl//absl/status:statusor",
+    ],
+)
+
+cc_test(
+    name = "disk_data_store_test",
+    srcs = ["disk_data_store_test.cc"],
+    deps = [
+        ":disk_data_store",
+        "//common:status_test_macros",
+        "//common:testing_clock",
+        "//manifest:content_id",
+        "@com_google_googletest//:gtest",
+        "@com_google_googletest//:gtest_main",
+    ],
+)
+
+cc_test(
+    name = "data_provider_test",
+    srcs = ["data_provider_test.cc"],
+    deps = [
+        ":data_provider",
+        ":disk_data_store",
+        ":mem_data_store",
+        "//common:status_test_macros",
+        "//common:testing_clock",
+        "//common:util",
+        "//manifest:content_id",
+        "@com_google_googletest//:gtest",
+        "@com_google_googletest//:gtest_main",
+    ],
+)
+
+cc_library(
+    name = "grpc_reader",
+    srcs = ["grpc_reader.cc"],
+    hdrs = ["grpc_reader.h"],
+    deps = [
+        ":data_store",
+        "//cdc_fuse_fs:asset_stream_client",
+        "//common:buffer",
+        "//common:status",
+        "//common:status_macros",
+        "//manifest:content_id",
+        "@com_google_absl//absl/status",
+        "@com_google_absl//absl/status:statusor",
+    ],
+)
+
+cc_library(
+    name = "mem_data_store",
+    srcs = ["mem_data_store.cc"],
+    hdrs = ["mem_data_store.h"],
+    deps = [
+        ":data_store",
+        "//common:status",
+    ],
+)
+
+cc_test(
+    name = "mem_data_store_test",
+    srcs = ["mem_data_store_test.cc"],
+    deps = [
+        ":mem_data_store",
+        "//common:status_test_macros",
+        "//manifest:content_id",
+        "@com_google_googletest//:gtest",
+        "@com_google_googletest//:gtest_main",
+    ],
+)
+
+filegroup(
+    name = "all_test_sources",
+    srcs = glob(["*_test.cc"]),
+)