Initial download shelf on OS X....

chrome/browser/download/download_manager.cc

 // Copyright (c) 2006-2009 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 "chrome/browser/download/download_manager.h"
 
 #include "app/l10n_util.h"
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/message_loop.h"
@@ skipping 618 matching lines @@
       NewRunnableMethod(this,
                         &DownloadManager::OnPathExistenceAvailable,
                         info));
 }
 
 void DownloadManager::OnPathExistenceAvailable(DownloadCreateInfo* info) {
   DCHECK(MessageLoop::current() == ui_loop_);
   DCHECK(info);
 
   if (info->save_as) {
+#if defined(OS_WIN) || defined(OS_LINUX)
     // We must ask the user for the place to put the download.
     if (!select_file_dialog_.get())
       select_file_dialog_ = SelectFileDialog::Create(this);
 
     TabContents* contents = tab_util::GetTabContentsByID(
         info->render_process_id, info->render_view_id);
     SelectFileDialog::FileTypeInfo file_type_info;
     file_type_info.extensions.resize(1);
     file_type_info.extensions[0].push_back(info->suggested_path.Extension());
     if (!file_type_info.extensions[0][0].empty())
       file_type_info.extensions[0][0].erase(0, 1);  // drop the .
     file_type_info.include_all_files = true;
     gfx::NativeWindow owning_window =
         contents ? platform_util::GetTopLevel(contents->GetNativeView()) : NULL;
     select_file_dialog_->SelectFile(SelectFileDialog::SELECT_SAVEAS_FILE,
                                     string16(),
                                     info->suggested_path,
                                     &file_type_info, 0, FILE_PATH_LITERAL(""),
                                     owning_window, info);
+#elif defined(OS_MACOSX)
+    // TODO(port): port this file -- need dialogs.
+    NOTIMPLEMENTED();
+#endif
   } else {
     // No prompting for download, just continue with the suggested name.
     ContinueStartDownload(info, info->suggested_path);
   }
 }
 
 void DownloadManager::ContinueStartDownload(DownloadCreateInfo* info,
                                             const FilePath& target_path) {
   scoped_ptr<DownloadCreateInfo> infop(info);
   info->path = target_path;
@@ skipping 832 matching lines @@
   }
 
   if (contents)
     contents->OnStartDownload(download);
 }
 
 // Clears the last download path, used to initialize "save as" dialogs.
 void DownloadManager::ClearLastDownloadPath() {
   last_download_path_ = FilePath();
 }