Add arflags to GN

tools/gn/config_values_generator.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/config_values_generator.h"
 
 #include "base/strings/string_util.h"
 #include "tools/gn/config_values.h"
 #include "tools/gn/scope.h"
 #include "tools/gn/settings.h"
@@ skipping 49 matching lines @@
 ConfigValuesGenerator::~ConfigValuesGenerator() {
 }
 
 void ConfigValuesGenerator::Run() {
 #define FILL_STRING_CONFIG_VALUE(name) \
     GetStringList(scope_, #name, config_values_, &ConfigValues::name, err_);
 #define FILL_DIR_CONFIG_VALUE(name) \
     GetDirList(scope_, #name, config_values_, input_dir_, \
                &ConfigValues::name, err_);
 
+  FILL_STRING_CONFIG_VALUE(arflags)
   FILL_STRING_CONFIG_VALUE(asmflags)
   FILL_STRING_CONFIG_VALUE(cflags)
   FILL_STRING_CONFIG_VALUE(cflags_c)
   FILL_STRING_CONFIG_VALUE(cflags_cc)
   FILL_STRING_CONFIG_VALUE(cflags_objc)
   FILL_STRING_CONFIG_VALUE(cflags_objcc)
   FILL_STRING_CONFIG_VALUE(defines)
   FILL_DIR_CONFIG_VALUE(   include_dirs)
   FILL_STRING_CONFIG_VALUE(ldflags)
   FILL_DIR_CONFIG_VALUE(   lib_dirs)
@@ skipping 31 matching lines @@
       scope_->GetValue(variables::kPrecompiledSource, true);
   if (precompiled_source_value) {
     config_values_->set_precompiled_source(
         input_dir_.ResolveRelativeFile(
             *precompiled_source_value, err_,
             scope_->settings()->build_settings()->root_path_utf8()));
     if (err_->has_error())
       return;
   }
 }