web_dev_style: Fix errors in new directories and enable PRESUBMIT

tools/web_dev_style/presubmit_support.py

Index: tools/web_dev_style/presubmit_support.py
diff --git a/tools/web_dev_style/presubmit_support.py b/tools/web_dev_style/presubmit_support.py
index 3be6d6d67b251b67cdadfe762981252635c8b36a..09da59450a88f9ab7240b4d2ac1a632bd99d58df 100644
--- a/tools/web_dev_style/presubmit_support.py
+++ b/tools/web_dev_style/presubmit_support.py
@@ -9,14 +9,15 @@ import js_checker
 import resource_checker
 
 
-def CheckStyle(input_api, output_api):
+def CheckStyle(input_api, output_api, file_filter=lambda f: True):
   apis = input_api, output_api
   is_resource = lambda f: f.LocalPath().endswith(('.html', '.css', '.js'))
+  wrapped_filter = lambda f: file_filter(f) and is_resource(f)
   checkers = [
-      css_checker.CSSChecker(*apis, file_filter=is_resource),
-      html_checker.HtmlChecker(*apis, file_filter=is_resource),
-      js_checker.JSChecker(*apis, file_filter=is_resource),
-      resource_checker.ResourceChecker(*apis, file_filter=is_resource),
+      css_checker.CSSChecker(*apis, file_filter=wrapped_filter),
+      html_checker.HtmlChecker(*apis, file_filter=wrapped_filter),
+      js_checker.JSChecker(*apis, file_filter=wrapped_filter),
+      resource_checker.ResourceChecker(*apis, file_filter=wrapped_filter),
   ]
   results = []
   for checker in checkers: