New loading model
Rename reload() to loadIfDirty()
loadIfDirty is implemented by MediaSet and is final
loadIfDirty is now blocking instead of async
Subclasses must implement two protected methods, isDirtyLocked() and load()
The change from async reload() to sync loadIfDirty() should be fine since
all users of reload() were doing so from a background thread already, and the
longest load() is PicasaAlbumSet which is still a fairly brisk 40ms or so
Change-Id: If5cc596a1c13e52e5f4efff1a144bd086d37cfb7
24 files changed