Support explicit pools in actions

tools/gn/ninja_toolchain_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_toolchain_writer.h"
 
 #include <fstream>
 
 #include "base/files/file_util.h"
 #include "base/strings/stringize_macros.h"
@@ skipping 28 matching lines @@
 NinjaToolchainWriter::~NinjaToolchainWriter() {
 }
 
 void NinjaToolchainWriter::Run(
     const std::vector<NinjaWriter::TargetRulePair>& rules) {
   std::string rule_prefix = GetNinjaRulePrefixForToolchain(settings_);
 
   for (int i = Toolchain::TYPE_NONE + 1; i < Toolchain::TYPE_NUMTYPES; i++) {
     Toolchain::ToolType tool_type = static_cast<Toolchain::ToolType>(i);
     const Tool* tool = toolchain_->GetTool(tool_type);
+    if (tool_type == Toolchain::TYPE_ACTION)
+      continue;
     if (tool)
       WriteToolRule(tool_type, tool, rule_prefix);
   }
   out_ << std::endl;
 
   for (const auto& pair : rules)
     out_ << pair.second;
 }
 
 // static
@@ skipping 59 matching lines @@
 
 void NinjaToolchainWriter::WriteRulePattern(const char* name,
                                             const SubstitutionPattern& pattern,
                                             const EscapeOptions& options) {
   if (pattern.empty())
     return;
   out_ << kIndent << name << " = ";
   SubstitutionWriter::WriteWithNinjaVariables(pattern, options, out_);
   out_ << std::endl;
 }