Add BrowserSelectFileDialogTest.OpenCloseFileDialog

ui/shell_dialogs/select_file_dialog.h

 // 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.
 
 #ifndef UI_SHELL_DIALOGS_SELECT_FILE_DIALOG_H_
 #define UI_SHELL_DIALOGS_SELECT_FILE_DIALOG_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 152 matching lines @@
   // NOTE: only one instance of any shell dialog can be shown per owning_window
   //       at a time (for obvious reasons).
   void SelectFile(Type type,
                   const base::string16& title,
                   const base::FilePath& default_path,
                   const FileTypeInfo* file_types,
                   int file_type_index,
                   const base::FilePath::StringType& default_extension,
                   gfx::NativeWindow owning_window,
                   void* params);
+
+  // Close the file-picker by sending an ESC key event to it.

[msw, 2015/10/23 22:33:26]

nit: technically the ESC key technique is specific to the GTK2 impl, so I'd
remove that part of this comment (or move it into the body of the gtk2 impl).

+  virtual void Close();
+
   bool HasMultipleFileTypeChoices();
 
   // Sets the global ShellDialogsDelegate. Defaults to NULL.
   static void SetShellDialogsDelegate(ShellDialogsDelegate* delegate);
 
  protected:
   friend class base::RefCountedThreadSafe<SelectFileDialog>;
   explicit SelectFileDialog(Listener* listener, SelectFilePolicy* policy);
   ~SelectFileDialog() override;
 
@@ skipping 31 matching lines @@
   virtual bool HasMultipleFileTypeChoicesImpl() = 0;
 
   scoped_ptr<SelectFilePolicy> select_file_policy_;
 
   DISALLOW_COPY_AND_ASSIGN(SelectFileDialog);
 };
 
 }  // namespace ui
 
 #endif  // UI_SHELL_DIALOGS_SELECT_FILE_DIALOG_H_