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.

asset_stream_manager/BUILD

@@ -0,0 +1,186 @@
+package(default_visibility = [
+    "//:__subpackages__",
+])
+
+cc_binary(
+    name = "asset_stream_manager",
+    srcs = ["main.cc"],
+    data = [":roots_pem"],
+    deps = [
+        ":asset_stream_config",
+        ":session_management_server",
+        "//common:log",
+        "//common:path",
+        "//common:sdk_util",
+        "//data_store:data_provider",
+    ],
+)
+
+cc_library(
+    name = "asset_stream_server",
+    srcs = [
+        "asset_stream_server.cc",
+        "grpc_asset_stream_server.cc",
+        "testing_asset_stream_server.cc",
+    ],
+    hdrs = [
+        "asset_stream_server.h",
+        "grpc_asset_stream_server.h",
+        "testing_asset_stream_server.h",
+    ],
+    deps = [
+        "//common:grpc_status",
+        "//common:log",
+        "//common:path",
+        "//common:status",
+        "//common:status_macros",
+        "//common:thread_safe_map",
+        "//data_store",
+        "//manifest:manifest_updater",
+        "//proto:asset_stream_service_grpc_proto",
+        "@com_google_absl//absl/strings:str_format",
+        "@com_google_absl//absl/time",
+    ],
+)
+
+cc_library(
+    name = "asset_stream_config",
+    srcs = ["asset_stream_config.cc"],
+    hdrs = ["asset_stream_config.h"],
+    deps = [
+        ":multi_session",
+        "//absl_helper:jedec_size_flag",
+        "//common:log",
+        "//common:path",
+        "//common:status_macros",
+        "@com_github_jsoncpp//:jsoncpp",
+        "@com_google_absl//absl/flags:parse",
+    ],
+)
+
+cc_library(
+    name = "cdc_fuse_manager",
+    srcs = ["cdc_fuse_manager.cc"],
+    hdrs = ["cdc_fuse_manager.h"],
+    deps = [
+        "//cdc_fuse_fs:constants",
+        "//common:gamelet_component",
+        "//common:remote_util",
+        "//common:status_macros",
+        "@com_google_absl//absl/status",
+        "@com_google_absl//absl/strings:str_format",
+    ],
+)
+
+cc_library(
+    name = "session_management_server",
+    srcs = [
+        "background_service_impl.cc",
+        "background_service_impl.h",
+        "local_assets_stream_manager_service_impl.cc",
+        "local_assets_stream_manager_service_impl.h",
+        "session_management_server.cc",
+        "session_manager.cc",
+        "session_manager.h",
+    ],
+    hdrs = ["session_management_server.h"],
+    deps = [
+        ":multi_session",
+        "//common:grpc_status",
+        "//common:log",
+        "//common:status_macros",
+        "//common:util",
+        "//manifest:manifest_updater",
+        "//metrics",
+        "//proto:background_service_grpc_proto",
+        "//proto:local_assets_stream_manager_grpc_proto",
+        "@com_google_absl//absl/strings",
+    ],
+)
+
+cc_library(
+    name = "multi_session",
+    srcs = [
+        "multi_session.cc",
+        "session.cc",
+        "session.h",
+    ],
+    hdrs = [
+        "multi_session.h",
+        "session_config.h",
+    ],
+    deps = [
+        ":asset_stream_server",
+        ":cdc_fuse_manager",
+        ":metrics_recorder",
+        "//common:file_watcher",
+        "//common:log",
+        "//common:path",
+        "//common:port_manager",
+        "//common:process",
+        "//common:remote_util",
+        "//common:sdk_util",
+        "//common:status_macros",
+        "//common:stopwatch",
+        "//data_store:disk_data_store",
+        "//manifest:manifest_printer",
+        "//manifest:manifest_updater",
+        "@com_google_absl//absl/status",
+    ],
+)
+
+cc_test(
+    name = "multi_session_test",
+    srcs = ["multi_session_test.cc"],
+    data = [":all_test_data"],
+    deps = [
+        ":multi_session",
+        "//common:test_main",
+        "//manifest:manifest_test_base",
+        "@com_google_googletest//:gtest",
+    ],
+)
+
+cc_library(
+    name = "metrics_recorder",
+    srcs = ["metrics_recorder.cc"],
+    hdrs = ["metrics_recorder.h"],
+    deps = [
+        "//common:log",
+        "//common:util",
+        "//metrics",
+        "//metrics:enums",
+        "//metrics:messages",
+        "@com_google_absl//absl/status",
+    ],
+)
+
+cc_test(
+    name = "metrics_recorder_test",
+    srcs = ["metrics_recorder_test.cc"],
+    deps = [
+        ":metrics_recorder",
+        "//common:status_test_macros",
+        "//common:test_main",
+        "//metrics",
+        "@com_google_googletest//:gtest",
+    ],
+)
+
+# Copy roots.pem to the output folder, required for authenticated gRPC.
+genrule(
+    name = "roots_pem",
+    srcs = ["@com_github_grpc_grpc//:root_certificates"],
+    outs = ["roots.pem"],
+    cmd = "cp $(location @com_github_grpc_grpc//:root_certificates) $(location roots.pem)",
+)
+
+filegroup(
+    name = "all_test_sources",
+    srcs = glob(["*_test.cc"]),
+)
+
+filegroup(
+    name = "all_test_data",
+    srcs = glob(["testdata/**"]),
+)