Add support for module-definition files to gn

tools/gn/ninja_binary_target_writer.h

Index: tools/gn/ninja_binary_target_writer.h
diff --git a/tools/gn/ninja_binary_target_writer.h b/tools/gn/ninja_binary_target_writer.h
index 22d2332c8f409c9a5d852128bedb43fb76ef3d00..977e9823fe4fd075949b2f1d9058126cc66ac541 100644
--- a/tools/gn/ninja_binary_target_writer.h
+++ b/tools/gn/ninja_binary_target_writer.h
@@ -26,9 +26,11 @@ class NinjaBinaryTargetWriter : public NinjaTargetWriter {
   typedef std::set<OutputFile> OutputFileSet;
 
   void WriteCompilerVars();
-  void WriteSources(std::vector<OutputFile>* object_files);
-  void WriteLinkerStuff(const std::vector<OutputFile>& object_files);
-  void WriteLinkerFlags();
+  void WriteSources(std::vector<OutputFile>* object_files,
+                    std::vector<SourceFile>* other_files);
+  void WriteLinkerStuff(const std::vector<OutputFile>& object_files,
+                        const std::vector<SourceFile>& other_files);
+  void WriteLinkerFlags(const SourceFile* optional_def_file);
   void WriteLibs();
   void WriteOutputExtension();
   void WriteSolibs(const std::vector<OutputFile>& solibs);