SimpleCache: try to recover on CreateEntry on missing cache dir

net/disk_cache/simple/simple_synchronous_entry.cc

 // Copyright (c) 2013 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 "net/disk_cache/simple/simple_synchronous_entry.h"
 
 #include <algorithm>
 #include <cstring>
 #include <functional>
 #include <limits>
@@ skipping 850 matching lines @@
 
   if (CanOmitEmptyFile(file_index) && file_required == FILE_NOT_REQUIRED) {
     empty_file_omitted_[file_index] = true;
     return true;
   }
 
   FilePath filename = GetFilenameFromFileIndex(file_index);
   int flags = File::FLAG_CREATE | File::FLAG_READ | File::FLAG_WRITE |
               File::FLAG_SHARE_DELETE;
   files_[file_index].Initialize(filename, flags);
+
+  // It's possible that the creation failed because someone deleted the
+  // directory (e.g. because someone pressed "clear cache" on Android).
+  // If so, we would keep failing for a while until periodic index snapshot
+  // re-creates the cache dir, so try to recover from it quickly here.
+  if (!files_[file_index].IsValid() &&
+      files_[file_index].error_details() == File::FILE_ERROR_NOT_FOUND &&
+      !base::DirectoryExists(path_)) {
+    if (base::CreateDirectory(path_))
+      files_[file_index].Initialize(filename, flags);
+  }
+
   *out_error = files_[file_index].error_details();
-
   empty_file_omitted_[file_index] = false;
 
   return files_[file_index].IsValid();
 }
 
 bool SimpleSynchronousEntry::OpenFiles(SimpleEntryStat* out_entry_stat) {
   for (int i = 0; i < kSimpleEntryFileCount; ++i) {
     File::Error error;
     if (!MaybeOpenFile(i, &error)) {
       // TODO(juliatuttle,gavinp): Remove one each of these triplets of
@@ skipping 751 matching lines @@
   range.offset = offset;
   range.length = len;
   range.data_crc32 = data_crc32;
   range.file_offset = data_file_offset;
   sparse_ranges_.insert(std::make_pair(offset, range));
 
   return true;
 }
 
 }  // namespace disk_cache