Add colorBackground(Floating) to DeviceDefault.Dialog

Adds the attributes colorBackground and colorBackgroundFloating to
Theme.DeviceDefault.Light.Dialog and Theme.DeviceDefault.Dialog so they
will be properly overlaid.

Test: manual using the theme in a dialog
Bug: 173562519
Change-Id: If1cff7ca3144d9ef0581219569dd514c7a4c89d7
1 file changed