AU: Try delta updates first, then full updates

src/platform/update_engine/filesystem_copier_action.cc

 // Copyright (c) 2009 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.
 
 #include "update_engine/filesystem_copier_action.h"
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <stdlib.h>
 #include <algorithm>
+#include <map>
 #include <string>
 #include <vector>
 #include "update_engine/filesystem_iterator.h"
 #include "update_engine/subprocess.h"
 #include "update_engine/utils.h"
 
+using std::map;
 using std::min;
 using std::string;
 using std::vector;
 
 namespace chromeos_update_engine {
 
 namespace {
 const char* kMountpointTemplate = "/tmp/au_dest_mnt.XXXXXX";
 const off_t kCopyFileBufferSize = 4 * 1024 * 1024;
 const char* kCopyExclusionPrefix = "/lost+found";
@@ skipping 268 matching lines @@
   }
   TEST_AND_RETURN_FALSE(!iter.IsErr());
   // Success!
   return true;
 }
 
 const char* FilesystemCopierAction::kCompleteFilesystemMarker(
     "/update_engine_copy_success");
 
 }  // namespace chromeos_update_engine