Windows precompiled header support in GN

tools/gn/tool.h

 // Copyright 2014 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_TOOL_H_
 #define TOOLS_GN_TOOL_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "tools/gn/substitution_list.h"
 #include "tools/gn/substitution_pattern.h"
 
 class Tool {
  public:
   enum DepsFormat {
     DEPS_GCC = 0,
     DEPS_MSVC = 1
   };
 
+  enum PrecompiledHeaderType {
+    PCH_NONE = 0,
+    PCH_GCC = 1,
+    PCH_MSVC = 2
+  };
+
   Tool();
   ~Tool();
 
   // Getters/setters ----------------------------------------------------------
   //
   // After the tool has had its attributes set, the caller must call
   // SetComplete(), at which point no other changes can be made.
 
   // Command to run.
   const SubstitutionPattern& command() const {
@@ skipping 24 matching lines @@
   }
 
   DepsFormat depsformat() const {
     return depsformat_;
   }
   void set_depsformat(DepsFormat f) {
     DCHECK(!complete_);
     depsformat_ = f;
   }
 
+  PrecompiledHeaderType precompiled_header_type() const { 
+    return precompiled_header_type_;
+  }
+  void set_precompiled_header_type(PrecompiledHeaderType pch_type) {
+    precompiled_header_type_ = pch_type;
+  }
+
   const SubstitutionPattern& description() const {
     return description_;
   }
   void set_description(const SubstitutionPattern& desc) {
     DCHECK(!complete_);
     description_ = desc;
   }
 
   const std::string& lib_switch() const {
     return lib_switch_;
@@ skipping 84 matching lines @@
   const SubstitutionBits& substitution_bits() const {
     DCHECK(complete_);
     return substitution_bits_;
   }
 
  private:
   SubstitutionPattern command_;
   std::string default_output_extension_;
   SubstitutionPattern depfile_;
   DepsFormat depsformat_;
+  PrecompiledHeaderType precompiled_header_type_;
   SubstitutionPattern description_;
   std::string lib_switch_;
   std::string lib_dir_switch_;
   SubstitutionList outputs_;
   SubstitutionPattern link_output_;
   SubstitutionPattern depend_output_;
   std::string output_prefix_;
   bool restat_;
   SubstitutionPattern rspfile_;
   SubstitutionPattern rspfile_content_;
 
   bool complete_;
 
   SubstitutionBits substitution_bits_;
 
   DISALLOW_COPY_AND_ASSIGN(Tool);
 };
 
 #endif  // TOOLS_GN_TOOL_H_