Reland of Precompile more in Blink in Windows for faster compilations

Tools/Scripts/webkitpy/style/checkers/cpp.py

Index: Tools/Scripts/webkitpy/style/checkers/cpp.py
diff --git a/Tools/Scripts/webkitpy/style/checkers/cpp.py b/Tools/Scripts/webkitpy/style/checkers/cpp.py
index bac6adce8d3850446e65e5cb1d9007ff559b3849..6343113dc91cea7d91fb66be2fab87dd683f1eb6 100644
--- a/Tools/Scripts/webkitpy/style/checkers/cpp.py
+++ b/Tools/Scripts/webkitpy/style/checkers/cpp.py
@@ -3156,6 +3156,11 @@
     error_message = include_state.check_next_include_order(header_type,
                                                            file_extension == "h",
                                                            primary_header_exists)
+
+    # Normally including a _CONFIG_HEADER in another header file would be an error
+    # but not when included in a precompile header since that one will need it.
+    if error_message and "config.h" in error_message and "precompile" in filename.lower():
+        error_message = None
 
     # Check to make sure we have a blank line after primary header.
     if not error_message and header_type == _PRIMARY_HEADER: