servo: Merge #10155 - Generalize the style structs (from bholley:generalize_style_structs); r=SimonSapin

This allows geckolib to pass gecko style structs and have the style system write to them directly, provided we implement all the traits.

Source-Repo: https://github.com/servo/servo
Source-Revision: 605842f193aedc1151ab38a99c49f693c76e5cf3

servo/python/tidy.py

@@ -35,6 +35,7 @@ ignored_files = [
     # Generated and upstream code combined with our own. Could use cleanup
     os.path.join(".", "ports", "gonk", "src", "native_window_glue.cpp"),
     os.path.join(".", "ports", "geckolib", "bindings.rs"),
+    os.path.join(".", "ports", "geckolib", "gecko_style_structs.rs"),
     os.path.join(".", "resources", "hsts_preload.json"),
     os.path.join(".", "tests", "wpt", "metadata", "MANIFEST.json"),
     os.path.join(".", "tests", "wpt", "metadata-css", "MANIFEST.json"),
@@ -60,6 +61,8 @@ ignored_dirs = [
     # Generated and upstream code combined with our own. Could use cleanup
     os.path.join(".", "target"),
     os.path.join(".", "ports", "cef"),
+    # Tooling, generated locally from external repos.
+    os.path.join(".", "ports", "geckolib", "tools"),
     # Hidden directories
     os.path.join(".", "."),
 ]
@@ -260,6 +263,7 @@ def check_rust(file_name, lines):
     if not file_name.endswith(".rs") or \
        file_name.endswith("properties.mako.rs") or \
        file_name.endswith(os.path.join("style", "build.rs")) or \
+       file_name.endswith(os.path.join("geckolib", "build.rs")) or \
        file_name.endswith(os.path.join("unit", "style", "stylesheets.rs")):
         raise StopIteration
     comment_depth = 0