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

chrome/browser/resources/md_history/PRESUBMIT.py

Index: chrome/browser/resources/md_history/PRESUBMIT.py
diff --git a/chrome/browser/resources/md_history/PRESUBMIT.py b/chrome/browser/resources/md_history/PRESUBMIT.py
index 485e8861401a22fd4117142f1088dea8618d1ce4..2c041a4c7e7125da3426f63f4a4332936ac540cd 100644
--- a/chrome/browser/resources/md_history/PRESUBMIT.py
+++ b/chrome/browser/resources/md_history/PRESUBMIT.py
@@ -11,16 +11,16 @@ def CheckChangeOnUpload(input_api, output_api):
   def _is_md_history_file(path):
     return (path.startswith('chrome/browser/resources/md_history') and
             (not path.endswith('externs.js')) and
-            (not path.endswith('app.crisper.js')) and
-            (not path.endswith('app.vulcanized.html')) and
+            (not path.endswith('crisper.js')) and
+            (not path.endswith('vulcanized.html')) and
             (path.endswith('js') or path.endswith('html')))
 
-  def _affects_file(filename, paths):
-    return any([filename in path for path in paths])
-
   paths = [x.LocalPath() for x in input_api.change.AffectedFiles()]
   earliest_vulcanize_change = min(os.path.getmtime(x) for x in
-                                  ['app.vulcanized.html', 'app.crisper.js'])
+                                  ['app.vulcanized.html',
+                                   'app.crisper.js',
+                                   'lazy_load.vulcanized.html',
+                                   'lazy_load.crisper.js'])
   history_changes = filter(_is_md_history_file, paths)
   latest_history_change = 0
   if history_changes: