A small refactor of ImageData and LocalData.

1. isPhoto() removed since it's for checking if we can edit it.
Use isDataActionSupported() instead since is designed for this purpose.
2. AuxInfoSupportCallback is moved to LocalData since filmstrip doesn't care
about this and it's only available on the local data.

Change-Id: I4eed477d6cdbe729904577b77a7ba97eed90074f
7 files changed