Add toolchain directory to *.dll name generated by GN.

tools/gn/ninja_binary_target_writer.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/ninja_binary_target_writer.h"
 
 #include <set>
 
 #include "base/strings/string_util.h"
 #include "tools/gn/config_values_extractors.h"
@@ skipping 184 matching lines @@
   // The external output file is the one that other libs depend on.
   OutputFile external_output_file = helper_.GetTargetOutputFile(target_);
 
   // The internal output file is the "main thing" we think we're making. In
   // the case of shared libraries, this is the shared library and the external
   // output file is the import library. In other cases, the internal one and
   // the external one are the same.
   OutputFile internal_output_file;
   if (target_->output_type() == Target::SHARED_LIBRARY) {
     if (settings_->IsWin()) {
-      internal_output_file = OutputFile(target_->label().name() + ".dll");
+      internal_output_file.value() =
+          target_->settings()->toolchain_output_subdir().value();
+      internal_output_file.value().append(target_->label().name());
+      internal_output_file.value().append(".dll");
     } else {
       internal_output_file = external_output_file;
     }
   } else {
     internal_output_file = external_output_file;
   }
 
   // In Python see "self.ninja.build(output, command, input,"
   WriteLinkCommand(external_output_file, internal_output_file, object_files);
 
@@ skipping 242 matching lines @@
     }
 
     // Data files.
     const std::vector<SourceFile>& data = target_->data();
     for (size_t i = 0; i < data.size(); i++) {
       out_ << " ";
       path_output_.WriteFile(out_, data[i]);
     }
   }
 }