Implement target visibility in GN

tools/gn/functions.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "tools/gn/functions.h"
 
 #include <iostream>
 
 #include "base/environment.h"
 #include "base/strings/string_util.h"
@@ skipping 211 matching lines @@
     return Value();
 
   Label label(MakeLabelForScope(scope, function, args[0].string_value()));
 
   if (g_scheduler->verbose_logging())
     g_scheduler->Log("Defining config", label.GetUserVisibleName(true));
 
   // Create the new config.
   scoped_ptr<Config> config(new Config(scope->settings(), label));
   config->set_defined_from(function);
+  if (!Visibility::FillItemVisibility(config.get(), scope, err))
+    return Value();
 
   // Fill it.
   const SourceDir& input_dir = scope->GetSourceDir();
   ConfigValuesGenerator gen(&config->config_values(), scope, input_dir, err);
   gen.Run();
   if (err->has_error())
     return Value();
 
   // Mark as complete.
   scope->settings()->build_settings()->ItemDefined(config.PassAs<Item>());
@@ skipping 430 matching lines @@
     return found_function->second.executed_block_runner(
         function, args.list_value(), &block_scope, err);
   }
 
   // Otherwise it's a no-block function.
   return found_function->second.no_block_runner(scope, function,
                                                 args.list_value(), err);
 }
 
 }  // namespace functions