[Telemetry] Cause web server to keep resources in memory and thread requests.

tools/telemetry/telemetry/core/browser.py

 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 import collections
 import os
 
 from telemetry.core import browser_credentials
 from telemetry.core import extension_dict
 from telemetry.core import tab_list
 from telemetry.core import temporary_http_server
@@ skipping 154 matching lines @@
       self._http_server.Close()
       self._http_server = None
 
     self._browser_backend.Close()
     self.credentials = None
 
   @property
   def http_server(self):
     return self._http_server
 
-  def SetHTTPServerDirectory(self, path):
-    if path:
-      abs_path = os.path.abspath(path)
-      if self._http_server and self._http_server.path == path:
-        return
-    else:
-      abs_path = None
+  def SetHTTPServerDirectories(self, paths):
+    if paths and self._http_server and self._http_server.paths == paths:
+      return
 
     if self._http_server:
       self._http_server.Close()
       self._http_server = None
 
-    if not abs_path:
+    if not paths:
       return
 
     self._http_server = temporary_http_server.TemporaryHTTPServer(
-      self._browser_backend, abs_path)
+      self._browser_backend, paths)
 
   def SetReplayArchivePath(self, archive_path):
     if self._wpr_server:
       self._wpr_server.Close()
       self._wpr_server = None
 
     if not archive_path:
       return None
 
     if self._browser_backend.wpr_mode == wpr_modes.WPR_OFF:
       return
 
     use_record_mode = self._browser_backend.wpr_mode == wpr_modes.WPR_RECORD
     if not use_record_mode:
       assert os.path.isfile(archive_path)
 
     self._wpr_server = wpr_server.ReplayServer(
         self._browser_backend,
         archive_path,
         use_record_mode,
         self._browser_backend.WEBPAGEREPLAY_HOST,
         self._browser_backend.webpagereplay_local_http_port,
         self._browser_backend.webpagereplay_local_https_port,
         self._browser_backend.webpagereplay_remote_http_port,
         self._browser_backend.webpagereplay_remote_https_port)
 
   def GetStandardOutput(self):
     return self._browser_backend.GetStandardOutput()