When the download folder does not exist, change the download folder to a user's "Downloads"

content/browser/tab_contents/tab_contents.cc

 // Copyright (c) 2011 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 "content/browser/tab_contents/tab_contents.h"
 
 #include <cmath>
 
 #include "base/command_line.h"
 #include "base/metrics/histogram.h"
 #include "base/metrics/stats_counters.h"
 #include "base/string16.h"
 #include "base/string_util.h"
 #include "base/time.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/download/download_manager.h"
 #include "chrome/browser/download/download_request_limiter.h"
 #include "chrome/browser/download/download_util.h"
 #include "content/browser/browser_context.h"
+#include "chrome/browser/download/save_package_file_picker.h"
 #include "content/browser/child_process_security_policy.h"
 #include "content/browser/content_browser_client.h"
 #include "content/browser/debugger/devtools_manager.h"
 #include "content/browser/host_zoom_map.h"
 #include "content/browser/in_process_webkit/session_storage_namespace.h"
 #include "content/browser/load_from_memory_cache_details.h"
 #include "content/browser/load_notification_details.h"
 #include "content/browser/renderer_host/render_process_host.h"
 #include "content/browser/renderer_host/render_view_host.h"
 #include "content/browser/renderer_host/render_widget_host_view.h"
@@ skipping 740 matching lines @@
 
   Stop();
 
   // Create the save package and possibly prompt the user for the name to save
   // the page as. The user prompt is an asynchronous operation that runs on
   // another thread.
   save_package_ = new SavePackage(this);
   save_package_->GetSaveInfo();
 }
 
-// Used in automated testing to bypass prompting the user for file names.
-// Instead, the names and paths are hard coded rather than running them through
-// file name sanitation and extension / mime checking.
 bool TabContents::SavePage(const FilePath& main_file, const FilePath& dir_path,
                            SavePackage::SavePackageType save_type) {
   // Stop the page from navigating.
   Stop();
 
   save_package_ = new SavePackage(this, save_type, main_file, dir_path);
+  // Skips GetSaveInfo() and directly calls Init().
+  // We do not have to explicitly disable the select file dialog
+  // since we skip the process that can show the dialog.
   return save_package_->Init();
 }
 
+string16 TabContents::SavePageBasedOnDefaultPrefs() {
+  Stop();
+
+  save_package_ = new SavePackage(this);
+  // Disables the select file dialog.
+  SavePackageFilePicker::SetShouldPromptUser(false);
+  // This GetSaveInfo() calls save_package_->Init() in the background.
+  save_package_->GetSaveInfo();
+  return GetTitle();
+}
+
 void TabContents::OnSaveURL(const GURL& url) {
   DownloadManager* dlm = browser_context()->GetDownloadManager();
   dlm->DownloadUrl(url, GetURL(), "", this);
 }
 
 bool TabContents::IsActiveEntry(int32 page_id) {
   NavigationEntry* active_entry = controller_.GetActiveEntry();
   return (active_entry != NULL &&
           active_entry->site_instance() == GetSiteInstance() &&
           active_entry->page_id() == page_id);
@@ skipping 1135 matching lines @@
 }
 
 void TabContents::SwapInRenderViewHost(RenderViewHost* rvh) {
   render_manager_.SwapInRenderViewHost(rvh);
 }
 
 void TabContents::CreateViewAndSetSizeForRVH(RenderViewHost* rvh) {
   RenderWidgetHostView* rwh_view = view()->CreateViewForWidget(rvh);
   rwh_view->SetSize(view()->GetContainerSize());
 }