GN: don't write separate files for non-binary targets

tools/gn/ninja_toolchain_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_TOOLCHAIN_WRITER_H_
 #define TOOLS_GN_NINJA_TOOLCHAIN_WRITER_H_
 
 #include <iosfwd>
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
+#include "tools/gn/ninja_writer.h"
 #include "tools/gn/path_output.h"
 #include "tools/gn/toolchain.h"
 
 class BuildSettings;
 struct EscapeOptions;
 class Settings;
 class Target;
 class Tool;
 
 class NinjaToolchainWriter {
  public:
   // Takes the settings for the toolchain, as well as the list of all targets
   // associated with the toolchain.
-  static bool RunAndWriteFile(const Settings* settings,
-                              const Toolchain* toolchain,
-                              const std::vector<const Target*>& targets);
+  static bool RunAndWriteFile(
+      const Settings* settings,
+      const Toolchain* toolchain,
+      const std::vector<NinjaWriter::TargetRulePair>& rules);
 
  private:
   FRIEND_TEST_ALL_PREFIXES(NinjaToolchainWriter, WriteToolRule);
 
   NinjaToolchainWriter(const Settings* settings,
                        const Toolchain* toolchain,
-                       const std::vector<const Target*>& targets,
                        std::ostream& out);
   ~NinjaToolchainWriter();
 
-  void Run();
+  void Run(const std::vector<NinjaWriter::TargetRulePair>& extra_rules);
 
   void WriteRules();
   void WriteToolRule(Toolchain::ToolType type,
                      const Tool* tool,
                      const std::string& rule_prefix);
   void WriteRulePattern(const char* name,
                         const SubstitutionPattern& pattern,
                         const EscapeOptions& options);
-  void WriteSubninjas();
 
   const Settings* settings_;
   const Toolchain* toolchain_;
-  std::vector<const Target*> targets_;
   std::ostream& out_;
   PathOutput path_output_;
 
   DISALLOW_COPY_AND_ASSIGN(NinjaToolchainWriter);
 };
 
 #endif  // TOOLS_GN_NINJA_TOOLCHAIN_WRITER_H_