Add ninja console pool support to GN

tools/gn/ninja_action_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_action_target_writer.h"
 
 #include "base/strings/string_util.h"
 #include "tools/gn/deps_iterator.h"
 #include "tools/gn/err.h"
 #include "tools/gn/settings.h"
@@ skipping 56 matching lines @@
       // time any of its dependencies change.
       out_ << " | ";
       path_output_.WriteFile(out_, input_dep);
     }
     out_ << std::endl;
     if (target_->action_values().has_depfile()) {
       out_ << "  depfile = ";
       WriteDepfile(SourceFile());
       out_ << std::endl;
     }
+    if (target_->action_values().is_console()) {
+      out_ << "  pool = console";
+      out_ << std::endl;
+    }
   }
   out_ << std::endl;
 
   // Write the stamp, which also depends on all data deps. These are needed at
   // runtime and should be compiled when the action is, but don't need to be
   // done before we run the action.
   std::vector<OutputFile> data_outs;
   for (const auto& dep : target_->data_deps())
     data_outs.push_back(dep.ptr->dependency_output_file());
   WriteStampForTarget(output_files, data_outs);
@@ skipping 122 matching lines @@
     out_ << " ";
     path_output_.WriteFile(out_, (*output_files)[i]);
   }
 }
 
 void NinjaActionTargetWriter::WriteDepfile(const SourceFile& source) {
   path_output_.WriteFile(out_,
       SubstitutionWriter::ApplyPatternToSourceAsOutputFile(
           settings_, target_->action_values().depfile(), source));
 }