Forward bundle product_type to the compile_xcassets tool.

tools/gn/ninja_create_bundle_target_writer.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/ninja_create_bundle_target_writer.h"
 
 #include "base/macros.h"
 #include "base/strings/string_util.h"
 #include "tools/gn/filesystem_utils.h"
 #include "tools/gn/ninja_utils.h"
@@ skipping 146 matching lines @@
   std::set<SourceFile> asset_catalog_bundles;
   for (const auto& source : target_->bundle_data().assets_catalog_sources()) {
     out_ << " ";
     path_output_.WriteFile(out_, source);
     asset_catalog_bundles.insert(source);
   }
 
   out_ << " | ";
   path_output_.WriteFile(out_, input_dep);
   out_ << std::endl;
+
+  out_ << "  product_type = " << target_->bundle_data().product_type()
+       << std::endl;
 }
 
 OutputFile
 NinjaCreateBundleTargetWriter::WriteCompileAssetsCatalogInputDepsStamp(
     const std::vector<const Target*>& dependencies) {
   DCHECK(!dependencies.empty());
   if (dependencies.size() == 1)
     return dependencies[0]->dependency_output_file();
 
   OutputFile xcassets_input_stamp_file =
@@ skipping 95 matching lines @@
     out_ << " ";
     path_output_.WriteFile(out_, source);
   }
   for (const Target* target : dependencies) {
     out_ << " ";
     path_output_.WriteFile(out_, target->dependency_output_file());
   }
   out_ << std::endl;
   return code_signing_input_stamp_file;
 }