Extension docs server: many changes to bring down the latency of the server,

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

Index: chrome/common/extensions/docs/server2/api_data_source.py
diff --git a/chrome/common/extensions/docs/server2/api_data_source.py b/chrome/common/extensions/docs/server2/api_data_source.py
index f912e4e446cc8986cdba20e56549cc24407d9611..5234aa801f8149a150ad08a4e55a91ad0520c32a 100644
--- a/chrome/common/extensions/docs/server2/api_data_source.py
+++ b/chrome/common/extensions/docs/server2/api_data_source.py
@@ -5,6 +5,7 @@
 import json
 import logging
 import os
+import time
 
 from file_system import FileNotFoundError
 from handlebar_dict_generator import HandlebarDictGenerator
@@ -37,9 +38,9 @@ class APIDataSource(object):
       self._base_path = base_path
 
     def Create(self, request):
-      return APIDataSource(self._permissions_cache,
-                           self._json_cache,
-                           self._idl_cache,
+      return APIDataSource(self._permissions_cache.ScopeToRequest(),
+                           self._json_cache.ScopeToRequest(),
+                           self._idl_cache.ScopeToRequest(),
                            self._base_path,
                            self._samples_factory.Create(request))
 
@@ -96,6 +97,13 @@ class APIDataSource(object):
     return self.get(key)
 
   def get(self, key):
+    start_time = time.time()
+    try:
+      return self._do_get(key)
+    finally:
+      logging.info("ApiDataSource: %sms", (time.time() - start_time) * 1000)
+
+  def _do_get(self, key):
     path, ext = os.path.splitext(key)
     unix_name = model.UnixName(path)
     json_path = unix_name + '.json'