Add support for user defined "pool" 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 149 matching lines @@
 extern const char kDefines_Help[];
 
 extern const char kDepfile[];
 extern const char kDepfile_HelpShort[];
 extern const char kDepfile_Help[];
 
 extern const char kDeps[];
 extern const char kDeps_HelpShort[];
 extern const char kDeps_Help[];
 
+extern const char kDepth[];

[brettw, 2016/05/24 22:03:31]

This is never used or defined. I think it's OK not to have global definitions
for this since it's only used in one place. Just revert this file.

[sdefresne, 2016/05/26 15:38:37]

Ack.

+extern const char kDepth_HelpShort[];
+extern const char kDepth_Help[];
+
 extern const char kIncludeDirs[];
 extern const char kIncludeDirs_HelpShort[];
 extern const char kIncludeDirs_Help[];
 
 extern const char kInputs[];
 extern const char kInputs_HelpShort[];
 extern const char kInputs_Help[];
 
 extern const char kLdflags[];
 extern const char kLdflags_HelpShort[];
@@ skipping 92 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_