[GN]: Precompiled header support for GCC.

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 5888ac59bbac22c0ddda4788c2f12ca0adebc1e3..1a5e092e0cb183ae78f27c04f47b300c4464d844 100644
--- a/tools/gn/ninja_binary_target_writer.h
+++ b/tools/gn/ninja_binary_target_writer.h
@@ -55,15 +55,16 @@ class NinjaBinaryTargetWriter : public NinjaTargetWriter {
                                       const OutputFile& input_dep,
                                       std::vector<OutputFile>* object_files);
 
-  // Writes a Windows .pch compile build line for a language type.
-  void WriteWindowsPCHCommand(SubstitutionType flag_type,
-                              Toolchain::ToolType tool_type,
-                              const OutputFile& input_dep,
-                              std::vector<OutputFile>* object_files);
+  // Writes a .pch compile build line for a language type.
+  void WritePCHCommand(SubstitutionType flag_type,
+                       Toolchain::ToolType tool_type,
+                       Tool::PrecompiledHeaderType header_type,
+                       const OutputFile& input_dep,
+                       std::vector<OutputFile>* object_files);
 
   // extra_deps are additional dependencies to run before the rule.
   //
-  // iorder_only_dep is the name of the stamp file that covers the dependencies
+  // order_only_dep is the name of the stamp file that covers the dependencies
   // that must be run before doing any compiles.
   //
   // The files produced by the compiler will be added to two output vectors.