Docserver: Add support for viewing docs with a codereview patch applied

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

Index: chrome/common/extensions/docs/server2/instance_servlet.py
diff --git a/chrome/common/extensions/docs/server2/instance_servlet.py b/chrome/common/extensions/docs/server2/instance_servlet.py
index 5a091fa2e39924a295319e4865add0febd41a984..2523d996d47b9520784f1abd5186def52db6d4a3 100644
--- a/chrome/common/extensions/docs/server2/instance_servlet.py
+++ b/chrome/common/extensions/docs/server2/instance_servlet.py
@@ -5,6 +5,7 @@
 from appengine_wrappers import IsDevServer
 from branch_utility import BranchUtility
 from caching_file_system import CachingFileSystem
+from compiled_file_system import CompiledFileSystem
 from empty_dir_file_system import EmptyDirFileSystem
 from github_file_system import GithubFileSystem
 from third_party.json_schema_compiler.memoize import memoize
@@ -43,10 +44,16 @@ class _OfflineRenderServletDelegate(RenderServlet.Delegate):
         object_store_creator)
     app_samples_file_system = self._delegate.CreateAppSamplesFileSystem(
         object_store_creator)
+    compiled_host_fs_factory = CompiledFileSystem.Factory(
+        host_file_system,
+        object_store_creator)
     return ServerInstance(channel,
                           object_store_creator,
                           host_file_system,
-                          app_samples_file_system)
+                          app_samples_file_system,
+                          '/static' if channel == 'stable' else
+                              '/%s/static' % channel,
+                          compiled_host_fs_factory)
 
 class InstanceServlet(object):
   '''Servlet for running on normal AppEngine instances.