Add recursive pattern matching for subfolders in file_enumerator.

base/BUILD.gn

 # Copyright (c) 2013 The Chromium Authors. All rights reserved.

[Mark Mentovai, 2017/05/19 17:16:11]

CL description: you shouldn’t say “fix” because it’s not clear that there’s
anything wrong with the existing behavior. In fact, you retain the existing
behavior as one of the possible modes. You are, however, introducing a new mode.

CL description: “matches”

 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # HOW TO WRITE CONDITIONALS IN THIS FILE
 # ======================================
 #
 # In many other places, one would write a conditional that expresses all the
 # cases when a source file is used or unused, and then either add or subtract
 # it from the sources list in that case
 #
@@ skipping 1978 matching lines @@
     "debug/proc_maps_linux_unittest.cc",
     "debug/stack_trace_unittest.cc",
     "debug/task_annotator_unittest.cc",
     "debug/thread_heap_usage_tracker_unittest.cc",
     "deferred_sequenced_task_runner_unittest.cc",
     "environment_unittest.cc",
     "feature_list_unittest.cc",
     "file_version_info_win_unittest.cc",
     "files/dir_reader_posix_unittest.cc",
     "files/file_descriptor_watcher_posix_unittest.cc",
+    "files/file_enumerator_unittest.cc",
     "files/file_locking_unittest.cc",
     "files/file_path_unittest.cc",
     "files/file_path_watcher_unittest.cc",
     "files/file_proxy_unittest.cc",
     "files/file_unittest.cc",
     "files/file_util_proxy_unittest.cc",
     "files/file_util_unittest.cc",
     "files/important_file_writer_unittest.cc",
     "files/memory_mapped_file_unittest.cc",
     "files/scoped_platform_handle_unittest.cc",
@@ skipping 743 matching lines @@
 }
 
 fuzzer_test("base_json_correctness_fuzzer") {
   sources = [
     "json/correctness_fuzzer.cc",
   ]
   deps = [
     ":base",
   ]
 }