Vendor dependencies

Let's see how I like this workflow.

vendor/cxx/tools/buck/prelude/android/android_toolchain.bzl

@@ -0,0 +1,50 @@
+# Copyright (c) Meta Platforms, Inc. and affiliates.
+#
+# This source code is licensed under both the MIT license found in the
+# LICENSE-MIT file in the root directory of this source tree and the Apache
+# License, Version 2.0 found in the LICENSE-APACHE file in the root directory
+# of this source tree.
+
+AndroidPlatformInfo = provider(fields = [
+    "name",
+])
+
+AndroidToolchainInfo = provider(fields = [
+    "aapt2",
+    "adb",
+    "aidl",
+    "android_jar",
+    "android_bootclasspath",
+    "apk_builder",
+    "apk_module_graph",
+    "combine_native_library_dirs",
+    "compress_libraries",
+    "d8_command",
+    "exo_resources_rewriter",
+    "exopackage_agent_apk",
+    "filter_dex_class_names",
+    "filter_prebuilt_native_library_dir",
+    "multi_dex_command",
+    "copy_string_resources",
+    "filter_resources",
+    "framework_aidl_file",
+    "generate_build_config",
+    "generate_manifest",
+    "instrumentation_test_runner_classpath",
+    "instrumentation_test_runner_main_class",
+    "manifest_utils",
+    "merge_android_resources",
+    "merge_assets",
+    "merge_third_party_jar_resources",
+    "mini_aapt",
+    "native_libs_as_assets_metadata",
+    "optimized_proguard_config",
+    "package_strings_as_assets",
+    "proguard_config",
+    "proguard_jar",
+    "proguard_max_heap_size",
+    "r_dot_java_weight_factor",
+    "secondary_dex_weight_limit",
+    "unpack_aar",
+    "zipalign",
+])