Add initial prototype for the GN meta-buildsystem.

tools/gn/config_values_generator.h

Index: tools/gn/config_values_generator.h
diff --git a/tools/gn/config_values_generator.h b/tools/gn/config_values_generator.h
new file mode 100644
index 0000000000000000000000000000000000000000..79d90678dbb831d5b091e45eda45fcfbae7897d5
--- /dev/null
+++ b/tools/gn/config_values_generator.h
@@ -0,0 +1,48 @@
+// 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_CONFIG_VALUES_GENERATOR_H_
+#define TOOLS_GN_CONFIG_VALUES_GENERATOR_H_
+
+#include <string>
+#include <vector>
+
+#include "base/basictypes.h"
+#include "tools/gn/source_dir.h"
+
+class ConfigValues;
+class Err;
+class Scope;
+class Token;
+
+class ConfigValuesGenerator {
+ public:
+  ConfigValuesGenerator(ConfigValues* dest_values,
+                        const Scope* scope,
+                        const Token& function_token,
+                        const SourceDir& input_dir,
+                        Err* err);
+  ~ConfigValuesGenerator();
+
+  // Sets the error passed to the constructor on failure.
+  void Run();
+
+ private:
+  void FillDefines();
+  void FillIncludes();
+  void FillCflags();
+  void FillCflags_C();
+  void FillCflags_CC();
+  void FillLdflags();
+
+  ConfigValues* config_values_;
+  const Scope* scope_;
+  const Token& function_token_;
+  const SourceDir input_dir_;
+  Err* err_;
+
+  DISALLOW_COPY_AND_ASSIGN(ConfigValuesGenerator);
+};
+
+#endif  // TOOLS_GN_CONFIG_VALUES_GENERATOR_H_