Add ninja console pool support to GN

tools/gn/variables.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_VARIABLES_H_
 #define TOOLS_GN_VARIABLES_H_
 
 #include <map>
 
 #include "base/strings/string_piece.h"
@@ skipping 113 matching lines @@
 extern const char kCheckIncludes_Help[];
 
 extern const char kCompleteStaticLib[];
 extern const char kCompleteStaticLib_HelpShort[];
 extern const char kCompleteStaticLib_Help[];
 
 extern const char kConfigs[];
 extern const char kConfigs_HelpShort[];
 extern const char kConfigs_Help[];
 
+extern const char kConsole[];
+extern const char kConsole_HelpShort[];
+extern const char kConsole_Help[];
+
 extern const char kData[];
 extern const char kData_HelpShort[];
 extern const char kData_Help[];
 
 extern const char kDataDeps[];
 extern const char kDataDeps_HelpShort[];
 extern const char kDataDeps_Help[];
 
 extern const char kDefines[];
 extern const char kDefines_HelpShort[];
@@ skipping 96 matching lines @@
 // Note: this is used only for help so this getter is not threadsafe.
 const VariableInfoMap& GetBuiltinVariables();
 
 // Returns the variables used by target generators.
 // Note: this is used only for help so this getter is not threadsafe.
 const VariableInfoMap& GetTargetVariables();
 
 }  // namespace variables
 
 #endif  // TOOLS_GN_VARIABLES_H_