Add optional public header checking to GN build

tools/gn/target.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_TARGET_H_
 #define TOOLS_GN_TARGET_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 51 matching lines @@
   void set_output_name(const std::string& name) { output_name_ = name; }
 
   const std::string& output_extension() const { return output_extension_; }
   void set_output_extension(const std::string& extension) {
     output_extension_ = extension;
   }
 
   const FileList& sources() const { return sources_; }
   FileList& sources() { return sources_; }
 
+  // Set to true when all sources are public. This is the default. In this case
+  // the public headers list should be empty.
+  bool all_headers_public() const { return all_headers_public_; }
+  void set_all_headers_public(bool p) { all_headers_public_ = p; }
+
+  // When all_headers_public is false, this is the list of public headers. It
+  // could be empty which would mean no headers are public.
+  const FileList& public_headers() const { return public_headers_; }
+  FileList& public_headers() { return public_headers_; }
+
   // Compile-time extra dependencies.
   const FileList& source_prereqs() const { return source_prereqs_; }
   FileList& source_prereqs() { return source_prereqs_; }
 
   // Runtime dependencies.
   const FileList& data() const { return data_; }
   FileList& data() { return data_; }
 
   // Targets depending on this one should have an order dependency.
   bool hard_dep() const { return hard_dep_; }
@@ skipping 56 matching lines @@
  private:
   // Pulls necessary information from dependents to this one when all
   // dependencies have been resolved.
   void PullDependentTargetInfo(std::set<const Config*>* unique_configs);
 
   OutputType output_type_;
   std::string output_name_;
   std::string output_extension_;
 
   FileList sources_;
+  bool all_headers_public_;
+  FileList public_headers_;
   FileList source_prereqs_;
   FileList data_;
 
   bool hard_dep_;
 
   // Note that if there are any groups in the deps, once the target is resolved
   // these vectors will list *both* the groups as well as the groups' deps.
   //
   // This is because, in general, groups should be "transparent" ways to add
   // groups of dependencies, so adding the groups deps make this happen with
@@ skipping 23 matching lines @@
   OrderedSet<SourceDir> all_lib_dirs_;
   OrderedSet<std::string> all_libs_;
 
   ConfigValues config_values_;  // Used for all binary targets.
   ActionValues action_values_;  // Used for action[_foreach] targets.
 
   DISALLOW_COPY_AND_ASSIGN(Target);
 };
 
 #endif  // TOOLS_GN_TARGET_H_