MD History: Lazily load element files which are not needed for first paint

chrome/browser/PRESUBMIT.py

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Presubmit script for Chromium browser code.
 
 This script currently checks HTML/CSS/JS files in resources/ and ui/webui/.
 
 See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
 for more details about the presubmit API built into depot_tools, and see
@@ skipping 37 matching lines @@
 
   try:
     sys.path = [cwd] + old_path
     from web_dev_style import (resource_checker, css_checker, html_checker,
                                js_checker)
 
     search_dirs = (resources, webui)
     def _html_css_js_resource(p):
       return p.endswith(('.html', '.css', '.js')) and p.startswith(search_dirs)
 
-    BLACKLIST = ['chrome/browser/resources/md_downloads/crisper.js',
-                 'chrome/browser/resources/md_downloads/vulcanized.html',
-                 'chrome/browser/resources/md_history/app.crisper.js',
-                 'chrome/browser/resources/md_history/app.vulcanized.html',
-                 'chrome/browser/resources/pdf/index.html',
-                 'chrome/browser/resources/pdf/index.js']
+    BLACKLIST = [
+        'chrome/browser/resources/md_downloads/crisper.js',
+        'chrome/browser/resources/md_downloads/vulcanized.html',
+        'chrome/browser/resources/md_history/app.crisper.js',
+        'chrome/browser/resources/md_history/app.vulcanized.html',
+        'chrome/browser/resources/md_history/lazy_load.crisper.js',
+        'chrome/browser/resources/md_history/lazy_load.vulcanized.html',
+        'chrome/browser/resources/pdf/index.html',
+        'chrome/browser/resources/pdf/index.js'
+    ]
     def is_resource(maybe_resource):
       return (maybe_resource.LocalPath() not in BLACKLIST and

[calamity, 2016/09/22 04:00:09]

May just want to filter all *.vulcanized.html and *.crisper.js here.

[tsergeant, 2016/09/22 04:27:57]

Done.

           _html_css_js_resource(maybe_resource.AbsoluteLocalPath()))
 
     results.extend(resource_checker.ResourceChecker(
         input_api, output_api, file_filter=is_resource).RunChecks())
     results.extend(css_checker.CSSChecker(
         input_api, output_api, file_filter=is_resource).RunChecks())
     results.extend(html_checker.HtmlChecker(
         input_api, output_api, file_filter=is_resource).RunChecks())
     results.extend(js_checker.JSChecker(
         input_api, output_api, file_filter=is_resource).RunChecks())
   finally:
     sys.path = old_path
 
   return results