Create buck target to copy C++ files into OSS

Summary:
This new buck target will execute the code gen and copy C++ files to the output directory. This will be used to integrate these files into RN Tester

changelog: [internal] internal

Reviewed By: fkgozali

Differential Revision: D23115538

fbshipit-source-id: de4135be697c36cd559edf416986299511c31744

packages/react-native-codegen/DEFS.bzl

@@ -96,7 +96,9 @@ def rn_codegen_components(
     generate_shadow_node_cpp_name = "generated_shadow_node_cpp-{}".format(name)
     generate_shadow_node_h_name = "generated_shadow_node_h-{}".format(name)
     copy_generated_java_files = "copy_generated_java_files-{}".format(name)
+    copy_generated_cxx_files = "copy_generated_cxx_files-{}".format(name)
     zip_generated_java_files = "zip_generated_java_files-{}".format(name)
+    zip_generated_cxx_files = "zip_generated_cxx_files-{}".format(name)
 
     fb_native.genrule(
         name = generate_fixtures_rule_name,
@@ -162,6 +164,21 @@ def rn_codegen_components(
         labels = ["codegen_rule"],
     )
 
+    fb_native.genrule(
+        name = copy_generated_cxx_files,
+        cmd = "mkdir $OUT && find $(location :{}) -name '*.cpp' -o -name '*.h' -exec cp {{}} $OUT \\;".format(generate_fixtures_rule_name),
+        out = "cxx",
+        labels = ["codegen_rule"],
+    )
+
+    fb_native.zip_file(
+        name = zip_generated_cxx_files,
+        srcs = [":{}".format(copy_generated_cxx_files)],
+        out = "{}.src.zip".format(zip_generated_cxx_files),
+        visibility = ["PUBLIC"],
+        labels = ["codegen_rule"],
+    )
+
     fb_native.zip_file(
         name = zip_generated_java_files,
         srcs = [":{}".format(copy_generated_java_files)],
@@ -266,6 +283,22 @@ def rn_codegen_components(
             ],
         )
 
+        rn_android_library(
+            name = "generated_components_cxx-{}".format(name),
+            srcs = [
+                ":{}".format(zip_generated_cxx_files),
+            ],
+            labels = ["codegen_rule"],
+            visibility = ["PUBLIC"],
+            deps = [
+                react_native_dep("third-party/android/androidx:annotation"),
+                react_native_target("java/com/facebook/react/bridge:bridge"),
+                react_native_target("java/com/facebook/react/common:common"),
+                react_native_target("java/com/facebook/react/turbomodule/core:core"),
+                react_native_target("java/com/facebook/react/uimanager:uimanager"),
+            ],
+        )
+
     # Tests
     fb_xplat_cxx_test(
         name = "generated_tests-{}".format(name),