Improve GN public header file checking

tools/gn/input_file_manager.h

Index: tools/gn/input_file_manager.h
diff --git a/tools/gn/input_file_manager.h b/tools/gn/input_file_manager.h
index 5c5b5b00a45909dca33618834bf23bb8fc771c38..82b3cc57e6a252d9c04496172578d4d973016d2f 100644
--- a/tools/gn/input_file_manager.h
+++ b/tools/gn/input_file_manager.h
@@ -79,7 +79,8 @@ class InputFileManager : public base::RefCountedThreadSafe<InputFileManager> {
   // the values and lose context for error reporting, or somehow keep the
   // associated parse nodes, tokens, and file data in memory. This function
   // allows the latter.
-  void AddDynamicInput(InputFile** file,
+  void AddDynamicInput(const SourceFile& name,
+                       InputFile** file,
                        std::vector<Token>** tokens,
                        scoped_ptr<ParseNode>** parse_root);