Docserver: Include <h4> tags in the table of contents, it's needed for the API

chrome/common/extensions/docs/server2/table_of_contents_renderer.py

Index: chrome/common/extensions/docs/server2/table_of_contents_renderer.py
diff --git a/chrome/common/extensions/docs/server2/table_of_contents_renderer.py b/chrome/common/extensions/docs/server2/table_of_contents_renderer.py
index 38580f09173c381c2aabf9731cc0ae48b482a5ac..1d6f3bb5c10963e73ebae9c803b76b8d305cd724 100644
--- a/chrome/common/extensions/docs/server2/table_of_contents_renderer.py
+++ b/chrome/common/extensions/docs/server2/table_of_contents_renderer.py
@@ -14,8 +14,12 @@ class TableOfContentsRenderer(object):
   class for testability.
   '''
 
-  def __init__(self, host_file_system, compiled_fs_factory):
+  def __init__(self,
+               host_file_system,
+               compiled_fs_factory,
+               template_renderer):
     self._templates = compiled_fs_factory.ForTemplates(host_file_system)
+    self._template_renderer = template_renderer
 
   def Render(self, sections):
     '''Renders a list of DocumentSections |sections| and returns a tuple
@@ -43,7 +47,9 @@ class TableOfContentsRenderer(object):
         items_for_section[0]['separator'] = True
       toc_items.extend(items_for_section)
 
-    table_of_contents = table_of_contents_template.Render({
-      'items': toc_items
-    })
-    return table_of_contents.text, table_of_contents.errors
+    return self._template_renderer.Render(
+        self._templates.GetFromFile(
+            '%s/table_of_contents.html' % PRIVATE_TEMPLATES).Get(),
+        None,  # no request
+        data_sources=('partials'),
+        additional_context={'items': toc_items})