[Refactor Xcode Objects] Enable generating per file '--help' compiler flag

tools/gn/xcode_object.h

 // Copyright 2016 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_XCODE_OBJECT_H_
 #define TOOLS_GN_XCODE_OBJECT_H_
 
 #include <iosfwd>
 #include <map>
 #include <memory>
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
 
 // Helper classes to generate Xcode project files.
 //
 // This code is based on gyp xcodeproj_file.py generator. It does not support
 // all features of Xcode project but instead just enough to implement a hybrid
 // mode where Xcode uses external scripts to perform the compilation steps.
 //
 // See https://chromium.googlesource.com/external/gyp/+/master/pylib/gyp/xcodeproj_file.py
 // for more information on Xcode project file format.
 
+enum class CompilerFlags {
+  NONE,
+  HELP,
+};
+
 // PBXObjectClass -------------------------------------------------------------
 
 enum PBXObjectClass {
   // Those values needs to stay sorted in alphabetic order.
   PBXAggregateTargetClass,
   PBXBuildFileClass,
   PBXFileReferenceClass,
   PBXFrameworksBuildPhaseClass,
   PBXGroupClass,
   PBXNativeTargetClass,
@@ skipping 112 matching lines @@
 
  private:
   DISALLOW_COPY_AND_ASSIGN(PBXAggregateTarget);
 };
 
 // PBXBuildFile ---------------------------------------------------------------
 
 class PBXBuildFile : public PBXObject {
  public:
   PBXBuildFile(const PBXFileReference* file_reference,
-               const PBXSourcesBuildPhase* build_phase);
+               const PBXSourcesBuildPhase* build_phase,
+               const CompilerFlags compiler_flag);
   ~PBXBuildFile() override;
 
   // PXBObject implementation.
   PBXObjectClass Class() const override;
   std::string Name() const override;
   void Print(std::ostream& out, unsigned indent) const override;
 
  private:
   const PBXFileReference* file_reference_;
   const PBXSourcesBuildPhase* build_phase_;
+  const CompilerFlags compiler_flag_;
 
   DISALLOW_COPY_AND_ASSIGN(PBXBuildFile);
 };
 
 // PBXFileReference -----------------------------------------------------------
 
 class PBXFileReference : public PBXObject {
  public:
   PBXFileReference(const std::string& name,
                    const std::string& path,
@@ skipping 66 matching lines @@
  public:
   PBXNativeTarget(const std::string& name,
                   const std::string& shell_script,
                   const std::string& config_name,
                   const PBXAttributes& attributes,
                   const std::string& product_type,
                   const std::string& product_name,
                   const PBXFileReference* product_reference);
   ~PBXNativeTarget() override;
 
-  void AddFileForIndexing(const PBXFileReference* file_reference);
+  void AddFileForIndexing(const PBXFileReference* file_reference,
+                          const CompilerFlags compiler_flag);
 
   // PBXObject implementation.
   PBXObjectClass Class() const override;
   void Print(std::ostream& out, unsigned indent) const override;
 
  private:
   const PBXFileReference* product_reference_;
   std::string product_type_;
   std::string product_name_;
 
   DISALLOW_COPY_AND_ASSIGN(PBXNativeTarget);
 };
 
 // PBXProject -----------------------------------------------------------------
 
 class PBXProject : public PBXObject {
  public:
   PBXProject(const std::string& name,
              const std::string& config_name,
              const std::string& source_path,
              const PBXAttributes& attributes);
   ~PBXProject() override;
 
   void AddSourceFileToIndexingTarget(const std::string& navigator_path,
-                                     const std::string& source_path);
+                                     const std::string& source_path,
+                                     const CompilerFlags compiler_flag);
   void AddSourceFile(const std::string& navigator_path,
                      const std::string& source_path,
+                     const CompilerFlags compiler_flag,
                      PBXNativeTarget* target);
-
   void AddAggregateTarget(const std::string& name,
                           const std::string& shell_script);
   void AddIndexingTarget();
   void AddNativeTarget(const std::string& name,
                        const std::string& type,
                        const std::string& output_name,
                        const std::string& output_type,
                        const std::string& shell_script);
 
   void SetProjectDirPath(const std::string& project_dir_path);
@@ skipping 101 matching lines @@
   void Print(std::ostream& out, unsigned indent) const override;
 
  private:
   std::vector<std::unique_ptr<XCBuildConfiguration>> configurations_;
   const PBXObject* owner_reference_;
 
   DISALLOW_COPY_AND_ASSIGN(XCConfigurationList);
 };
 
 #endif  // TOOLS_GN_XCODE_OBJECT_H_