[Merge] lp:~artmello/gallery-app/gallery-app-startup_time into lp:gallery-app

[Bill Filler]

Review: Needs Fixing

Doesn't work. I get blank white screen for some seconds on startup. No loading animation underneath the tabs like we discussed.
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https://code.launchpad.net/~artmello/gallery-app/gallery-app-startup_time/+merge/234468
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