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A new sub-class of BitmapDrawable has been created which tracks
when it is being used or cached when running on Gingerbread or
older. A new ImageView subclass has been added to accomplish this,
as well as changes to the LruCache.

Change-Id: I95d3334684703aebb6b09fcd56194cf73e3c2dcf
Signed-off-by: Chris Banes <chrisbanes@google.com>