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

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

Index: chrome/common/extensions/docs/server2/server_instance.py
diff --git a/chrome/common/extensions/docs/server2/server_instance.py b/chrome/common/extensions/docs/server2/server_instance.py
index b313bd15a03608fc0ac2c53feb240343b1e49b60..5179e1cbdc13484d14351e5f290a5d12866a4637 100644
--- a/chrome/common/extensions/docs/server2/server_instance.py
+++ b/chrome/common/extensions/docs/server2/server_instance.py
@@ -67,10 +67,6 @@ class ServerInstance(object):
     assert base_path.startswith('/') and base_path.endswith('/')
     self.base_path = base_path
 
-    self.document_renderer = DocumentRenderer(TableOfContentsRenderer(
-        host_fs_at_trunk,
-        compiled_fs_factory))
-
     self.host_file_system_iterator = HostFileSystemIterator(
         host_file_system_provider,
         branch_utility)
@@ -153,6 +149,14 @@ class ServerInstance(object):
     # the entire ServerInstance doesn't need to be passed in here.
     self.template_renderer = TemplateRenderer(self)
 
+    # TODO(kalman): It may be better for |document_renderer| to construct a
+    # TemplateDataSource itself rather than depending on template_renderer, but
+    # for that the above todo should be addressed.
+    self.document_renderer = DocumentRenderer(TableOfContentsRenderer(
+        host_fs_at_trunk,
+        compiled_fs_factory,
+        self.template_renderer))
+
   @staticmethod
   def ForTest(file_system=None, file_system_provider=None, base_path='/'):
     object_store_creator = ObjectStoreCreator.ForTest()