Add include_protos option to generation (#177)

* Add include_protos option to generation

synthtool/gcp/gapic_generator.py

@@ -64,6 +64,7 @@ def _generate_code(
         config_path=None,
         artman_output_name=None,
         private=False,
+        include_protos=False,
     ):
         # map the language to the artman argument and subdir of genfiles
         GENERATE_FLAG_LANGUAGE = {
@@ -129,6 +130,17 @@ def _generate_code(
 
         log.success(f"Generated code into {genfiles}.")
 
+        # Get the *.protos files and put them in a protos dir in the output
+        if include_protos:
+            import shutil
+
+            source_dir = googleapis / config_path.parent
+            proto_files = source_dir.glob("**/*.proto")
+            os.mkdir(genfiles / "protos")
+            for i in proto_files:
+                shutil.copyfile(i, genfiles / "protos" / i.name)
+            log.success(f"Placed proto files into {genfiles}/protos.")
+
         metadata.add_client_destination(
             source="googleapis" if not private else "googleapis-private",
             api_name=service,