GN: toolchain threading cleanup

tools/gn/ninja_binary_target_writer.h

 // 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.
 
 #ifndef TOOLS_GN_NINJA_BINARY_TARGET_WRITER_H_
 #define TOOLS_GN_NINJA_BINARY_TARGET_WRITER_H_
 
 #include "base/compiler_specific.h"
 #include "tools/gn/ninja_target_writer.h"
 #include "tools/gn/toolchain.h"
 
 // Writes a .ninja file for a binary target type (an executable, a shared
 // library, or a static library).
 class NinjaBinaryTargetWriter : public NinjaTargetWriter {
  public:
-  NinjaBinaryTargetWriter(const Target* target, std::ostream& out);
+  NinjaBinaryTargetWriter(const Target* target,
+                          const Toolchain* toolchain,
+                          std::ostream& out);
   virtual ~NinjaBinaryTargetWriter();
 
   virtual void Run() OVERRIDE;
 
  private:
   typedef std::set<OutputFile> OutputFileSet;
 
   void WriteCompilerVars();
   void WriteSources(std::vector<OutputFile>* object_files);
   void WriteLinkerStuff(const std::vector<OutputFile>& object_files);
@@ skipping 30 matching lines @@
   void WriteImplicitDependencies(
       const std::vector<const Target*>& non_linkable_deps);
 
   Toolchain::ToolType tool_type_;
 
   DISALLOW_COPY_AND_ASSIGN(NinjaBinaryTargetWriter);
 };
 
 #endif  // TOOLS_GN_NINJA_BINARY_TARGET_WRITER_H_