[Refactor Xcode Objects] Allow extra attributes for native targets.

tools/gn/xcode_object.cc

 // Copyright 2016 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/xcode_object.h"
 
 #include <iomanip>
 #include <sstream>
 #include <utility>
 
@@ skipping 649 matching lines @@
   targets_.push_back(base::MakeUnique<PBXNativeTarget>(
       name_, std::string(), config_name_, attributes, product_type, name_,
       product_reference));
   target_for_indexing_ = static_cast<PBXNativeTarget*>(targets_.back().get());
 }
 
 void PBXProject::AddNativeTarget(const std::string& name,
                                  const std::string& type,
                                  const std::string& output_name,
                                  const std::string& output_type,
-                                 const std::string& shell_script) {
+                                 const std::string& shell_script,
+                                 const PBXAttributes& extra_attributes) {
   base::StringPiece ext = FindExtension(&output_name);
   PBXFileReference* product = static_cast<PBXFileReference*>(
       products_->AddChild(base::MakeUnique<PBXFileReference>(
           std::string(), output_name,
           type.empty() ? GetSourceType(ext) : type)));
 
   size_t ext_offset = FindExtensionOffset(output_name);
   std::string product_name = ext_offset != std::string::npos
                                  ? output_name.substr(0, ext_offset - 1)
                                  : output_name;
 
-  PBXAttributes attributes;
+  PBXAttributes attributes = extra_attributes;
   attributes["CODE_SIGNING_REQUIRED"] = "NO";
   attributes["CONFIGURATION_BUILD_DIR"] = ".";
   attributes["PRODUCT_NAME"] = product_name;
 
   targets_.push_back(base::MakeUnique<PBXNativeTarget>(
       name, shell_script, config_name_, attributes, output_type, product_name,
       product));
 }
 
 void PBXProject::SetProjectDirPath(const std::string& project_dir_path) {
@@ skipping 184 matching lines @@
   const std::string indent_str(indent, '\t');
   const IndentRules rules = {false, indent + 1};
   out << indent_str << Reference() << " = {\n";
   PrintProperty(out, rules, "isa", ToString(Class()));
   PrintProperty(out, rules, "buildConfigurations", configurations_);
   PrintProperty(out, rules, "defaultConfigurationIsVisible", 1u);
   PrintProperty(out, rules, "defaultConfigurationName",
                 configurations_[0]->Name());
   out << indent_str << "};\n";
 }