Cocoa: Implement media gallery dialog

chrome/browser/media_gallery/media_galleries_dialog_controller.h

Index: chrome/browser/media_gallery/media_galleries_dialog_controller.h
diff --git a/chrome/browser/media_gallery/media_galleries_dialog_controller.h b/chrome/browser/media_gallery/media_galleries_dialog_controller.h
index ba744a62552443923f7b3fc6a9d170e8c44a6a89..ec50bd08ca3316434189469a76c7d39da9478c5a 100644
--- a/chrome/browser/media_gallery/media_galleries_dialog_controller.h
+++ b/chrome/browser/media_gallery/media_galleries_dialog_controller.h
@@ -66,11 +66,12 @@ class MediaGalleriesDialogController : public ui::SelectFileDialog::Listener {
                                  const base::Callback<void(void)>& on_finish);
 
   // Called by the view.
-  string16 GetHeader();
-  string16 GetSubtext();
+  string16 GetHeader() const;
+  string16 GetSubtext() const;
+  bool HasPermittedGalleries() const;
   void OnAddFolderClicked();
-  virtual void GalleryToggled(const MediaGalleryPrefInfo* pref_info,
-                              bool enabled);
+  virtual void DidToggleGallery(const MediaGalleryPrefInfo* pref_info,
+                                bool enabled);
   virtual void DialogFinished(bool accepted);
 
   // SelectFileDialog::Listener implementation: