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.

tests_common/BUILD

@@ -0,0 +1,45 @@
+package(default_visibility = ["//visibility:public"])
+
+# Using a cc_binary rule here to avoid that this test is included when running
+# test from bazel directly. This target is just a convenience target for all the
+# unit tests in the scope run from Visual Studio, thus running the following
+# command would execute all tests twice:
+#
+# bazel test --build_tests_only //...
+#
+# To run this target with Bazel directly, just use "bazel run" instead of
+# "bazel test".
+cc_binary(
+    name = "tests_common",
+    testonly = True,
+    srcs = [
+        "//common:all_test_sources",
+    ],
+    data = [
+        "//common:all_test_data",
+    ],
+    deps = [
+        "//common:buffer",
+        "//common:dir_iter",
+        "//common:file_watcher",
+        "//common:gamelet_component",
+        "//common:log",
+        "//common:path",
+        "//common:path_filter",
+        "//common:platform",
+        "//common:port_manager",
+        "//common:process",
+        "//common:remote_util",
+        "//common:sdk_util",
+        "//common:semaphore",
+        "//common:status_test_macros",
+        "//common:stopwatch",
+        "//common:stub_process",
+        "//common:test_main",
+        "//common:testing_clock",
+        "//common:thread_safe_map",
+        "//common:threadpool",
+        "//common:url",
+        "//common:util",
+    ],
+)