[licenses] Add applicable_licenses to proto_library.gni

Change-Id: I038c52930c2227ae1a20205fdd81c85cdf7b8649

proto_library.gni

diff --git a/proto_library.gni b/proto_library.gni
index ad48971..4cd2114 100644
--- a/proto_library.gni
+++ b/proto_library.gni
@@ -138,7 +138,7 @@
   assert(!generate_go || !generate_go_grpc,
          "Only one of generate_go or generate_go_grpc can be enabled!")
 
-  not_needed(invoker, ["propagate_imports_configs"])
+  not_needed(invoker, [ "propagate_imports_configs" ])
 
   if (defined(invoker.generator_plugin_label)) {
     # Straightforward way to get the name of executable doesn't work because
@@ -218,10 +218,8 @@
     assert(!defined(invoker.generate_descriptor))
     descriptor_set_path_ = "${target_out_dir}/${target_name}.desc.pb"
   } else if (defined(invoker.generate_descriptor)) {
-    descriptor_set_path_ =
-        "$root_gen_dir/" + 
-        rebase_path(proto_out_dir, "//") +
-        invoker.generate_descriptor
+    descriptor_set_path_ = "$root_gen_dir/" + rebase_path(proto_out_dir, "//") +
+                           invoker.generate_descriptor
   }
   if (descriptor_set_path_ != "") {
     protogens += [ descriptor_set_path_ ]
@@ -255,11 +253,12 @@
     }
     if (descriptor_set_path_ != "") {
       # Descriptor-only protobuf targets do not use |proto_path|
-      not_needed(["proto_path"])
+      not_needed([ "proto_path" ])
     }
   }
 
   generated_file("${target_name}_protoc_outputs") {
+    forward_variables_from(invoker, [ "applicable_licenses" ])
     contents = rebase_path(protogens, root_build_dir)
     outputs = [ "${target_gen_dir}/${target_name}.protoc_output_info" ]
   }
@@ -269,6 +268,7 @@
 
   # Generate protobuf stubs.
   action(action_name) {
+    forward_variables_from(invoker, [ "applicable_licenses" ])
     visibility = []
     visibility = [ ":*" ]
     script = "//build/secondary/third_party/protobuf/protoc_wrapper.py"
@@ -430,6 +430,7 @@
     static_library(_static_lib_name) {
       forward_variables_from(invoker,
                              [
+                               "applicable_licenses",
                                "defines",
                                "deps",
                                "testonly",
@@ -471,8 +472,7 @@
 
         # Allows generated protobufs to use #include subpaths rooted from
         # |proto_out_dir|.
-        include_dirs = [ "${root_gen_dir}/" +
-                         rebase_path(proto_out_dir, "//") ]
+        include_dirs = [ "${root_gen_dir}/" + rebase_path(proto_out_dir, "//") ]
       }
     }
   }