Media galleries: configuration dialog controller and GTK impl.

chrome/chrome_browser.gypi

Index: chrome/chrome_browser.gypi
diff --git a/chrome/chrome_browser.gypi b/chrome/chrome_browser.gypi
index 67f92abc79359284fdc1c174f79779942a75eb70..dbe596ac1e2bfc200aa3992b7034ae91c8e9f7ab 100644
--- a/chrome/chrome_browser.gypi
+++ b/chrome/chrome_browser.gypi
@@ -1438,6 +1438,7 @@
         'browser/media_gallery/media_device_notifications_window_win.h',
         'browser/media_gallery/media_file_system_registry.cc',
         'browser/media_gallery/media_file_system_registry.h',
+        'browser/media_gallery/media_galleries_dialog_controller.h',
         'browser/media_gallery/media_galleries_preferences.cc',
         'browser/media_gallery/media_galleries_preferences.h',
         'browser/media_gallery/media_galleries_preferences_factory.cc',
@@ -3147,6 +3148,8 @@
         'browser/ui/gtk/extensions/extension_uninstall_dialog_gtk.cc',
         'browser/ui/gtk/extensions/extension_view_gtk.cc',
         'browser/ui/gtk/extensions/extension_view_gtk.h',
+        'browser/ui/gtk/extensions/media_galleries_dialog_gtk.cc',
+        'browser/ui/gtk/extensions/media_galleries_dialog_gtk.h',
         'browser/ui/gtk/extensions/shell_window_gtk.cc',
         'browser/ui/gtk/extensions/shell_window_gtk.h',
         'browser/ui/gtk/external_protocol_dialog_gtk.cc',
@@ -4860,6 +4863,7 @@
             '../third_party/undoview/undoview.gyp:undoview',
           ],
           'sources': [
+            'browser/media_gallery/media_galleries_dialog_controller.cc',
             'browser/ui/startup/obsolete_os_info_bar.cc',
             'browser/ui/startup/obsolete_os_info_bar.h',
           ],