Move download filename determination into a separate class.

chrome/browser/download/download_file_picker.h

 // 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.
 
 #ifndef CHROME_BROWSER_DOWNLOAD_DOWNLOAD_FILE_PICKER_H_
 #define CHROME_BROWSER_DOWNLOAD_DOWNLOAD_FILE_PICKER_H_
 
-#include "chrome/browser/download/chrome_download_manager_delegate.h"
+#include "base/callback.h"
 #include "ui/shell_dialogs/select_file_dialog.h"
 
 namespace base {
 class FilePath;
 }
 
 namespace content {
 class DownloadItem;
 class DownloadManager;
 class WebContents;
 }
 
 // Handles showing a dialog to the user to ask for the filename for a download.
 class DownloadFilePicker : public ui::SelectFileDialog::Listener {
  public:
-  DownloadFilePicker();
+  // Callback used to pass the user selection back to the owner of this
+  // object.
+  // |virtual_path|: The path chosen by the user. If the user cancels the file
+  //    selection, then this parameter will be the empty path. On Chrome OS,
+  //    this path may contain virtual mount points if the user chose a virtual
+  //    path (e.g. Google Drive).
+  typedef base::Callback<void(const base::FilePath& virtual_path)>
+      FileSelectedCallback;
+
+  // Display a file picker dialog for |item|. The |suggested_path| will be used
+  // as the initial path displayed to the user. |callback| will always be
+  // invoked even if |item| is destroyed prior to the file picker completing.
+  static void ShowFilePicker(content::DownloadItem* item,
+                             const base::FilePath& suggested_path,
+                             const FileSelectedCallback& callback);
+
+ private:
+  DownloadFilePicker(content::DownloadItem* item,
+                     const base::FilePath& suggested_path,
+                     const FileSelectedCallback& callback);
   virtual ~DownloadFilePicker();
 
-  void Init(content::DownloadManager* download_manager,
-            content::DownloadItem* item,
-            const base::FilePath& suggested_path,
-            const ChromeDownloadManagerDelegate::FileSelectedCallback&
-                callback);
+  // Runs |file_selected_callback_| with |virtual_path| and then deletes this
+  // object.
+  void OnFileSelected(const base::FilePath& virtual_path);
 
- protected:
-  // On ChromeOS |suggested_path| might be a temporary local filename. This
-  // method should be overridden to set the correct suggested path to prompt the
-  // user.
-  virtual void InitSuggestedPath(content::DownloadItem* item,
-                                 const base::FilePath& suggested_path);
-
-  void set_suggested_path(const base::FilePath& suggested_path) {
-    suggested_path_ = suggested_path;
-  }
-
-  // Runs |file_selected_callback_| with |path| and then deletes this object.
-  void OnFileSelected(const base::FilePath& path);
-
-  void RecordFileSelected(const base::FilePath& path);
-
-  scoped_refptr<content::DownloadManager> download_manager_;
-  int32 download_id_;
-
- private:
   // SelectFileDialog::Listener implementation.
   virtual void FileSelected(const base::FilePath& path,
                             int index,
                             void* params) OVERRIDE;
   virtual void FileSelectionCanceled(void* params) OVERRIDE;
 
+  // Initially suggested path.
   base::FilePath suggested_path_;
 
-  ChromeDownloadManagerDelegate::FileSelectedCallback file_selected_callback_;
+  // Callback invoked when a file selection is complete.
+  FileSelectedCallback file_selected_callback_;
 
   // For managing select file dialogs.
   scoped_refptr<ui::SelectFileDialog> select_file_dialog_;
 
+  // True if UMA regarding on the result of the file selection should be
+  // recorded.
+  bool should_record_file_picker_result_;
+
   DISALLOW_COPY_AND_ASSIGN(DownloadFilePicker);
 };
 
 #endif  // CHROME_BROWSER_DOWNLOAD_DOWNLOAD_FILE_PICKER_H_