Docserver: Use GitilesFileSystem instead of SubversionFileSystem

chrome/common/extensions/docs/server2/caching_file_system.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 posixpath
 import sys
 
 from file_system import FileSystem, StatInfo, FileNotFoundError
 from future import All, Future
 from path_util import AssertIsDirectory, IsDirectory, ToDirectory
@@ skipping 123 matching lines @@
       # constantly trying to read a file we now know doesn't exist.
       self._read_cache.SetMulti(
           dict((path, (None, None)) for path in paths
                if stat_futures[path].Get() is None))
       new_results.update(up_to_date_data)
       return new_results
     # Read in the values that were uncached or old.
     return self._file_system.Read(set(paths) - set(up_to_date_data.iterkeys()),
                                   skip_not_found=skip_not_found).Then(next)
 
+  def GetCommitID(self):
+    return self._file_system.GetCommitID()
+
+  def GetPreviousCommitID(self):
+    return self._file_system.GetPreviousCommitID()
+
   def Walk(self, root, depth=-1):
     '''Overrides FileSystem.Walk() to provide caching functionality.
     '''
     def file_lister(root):
       res, root_stat = All((self._walk_cache.Get(root),
                             self.StatAsync(root))).Get()
 
       if res and res[2] == root_stat.version:
         dirs, files = res[0], res[1]
       else:
         # Wasn't cached, or not up to date.
         dirs, files = [], []
         for f in self.ReadSingle(root).Get():
           if IsDirectory(f):
             dirs.append(f)
           else:
             files.append(f)
         # Update the cache. This is a root -> (dirs, files, version) mapping.
         self._walk_cache.Set(root, (dirs, files, root_stat.version))
       return dirs, files
     return self._file_system.Walk(root, depth=depth, file_lister=file_lister)
 
   def GetIdentity(self):
     return self._file_system.GetIdentity()
 
   def __repr__(self):
     return '%s of <%s>' % (type(self).__name__, repr(self._file_system))