Use last_selected_directory() when invalid path is passed to CrOS file picker.

chrome/browser/ui/views/select_file_dialog_extension.cc

 // 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.
 
 #include "chrome/browser/ui/views/select_file_dialog_extension.h"
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
@@ skipping 303 matching lines @@
   const PrefService* pref_service = profile_->GetPrefs();
 
   if (default_path.empty() && pref_service) {
     default_dialog_path =
         pref_service->GetFilePath(prefs::kDownloadDefaultDirectory);
   } else {
     default_dialog_path = default_path;
   }
 
   base::FilePath virtual_path;
-  if (file_manager_util::ConvertFileToRelativeFileSystemPath(
-          profile_, kFileBrowserDomain, default_dialog_path, &virtual_path)) {
+  // If an absolute path is specified as the default path, convert it to the
+  // virtual path in the file browser extension. Due to the current design,
+  // an invalid temporal cache file path may passed as |default_dialog_path|
+  // (crbug.com/178013 #9-#11). In such a case, we use the last selected
+  // directory as a workaround. Real fix is tracked at crbug.com/110119.
+  if (default_dialog_path.IsAbsolute() &&
+      (file_manager_util::ConvertFileToRelativeFileSystemPath(
+           profile_, kFileBrowserDomain, default_dialog_path, &virtual_path) ||
+       file_manager_util::ConvertFileToRelativeFileSystemPath(
+           profile_, kFileBrowserDomain, profile_->last_selected_directory(),
+           &virtual_path))) {
     virtual_path = base::FilePath("/").Append(virtual_path);
   } else {
+    // If the path was relative, or failed to convert, just use the base name,
     virtual_path = default_dialog_path.BaseName();
   }
 
   has_multiple_file_type_choices_ =
       file_types ? file_types->extensions.size() > 1 : true;
 
   GURL file_browser_url = file_manager_util::GetFileBrowserUrlWithParams(
       type, title, virtual_path, file_types, file_type_index,
       default_extension);
 
@@ skipping 16 matching lines @@
                                  kFileManagerMinimumHeight);
 
   // Connect our listener to FileDialogFunction's per-tab callbacks.
   AddPending(tab_id);
 
   extension_dialog_ = dialog;
   params_ = params;
   tab_id_ = tab_id;
   owner_window_ = owner_window;
 }