Gracefully handle drawing caches allocation failure.

Bug #3431451

This bug was causing ListView to not render properly when showing an item
larger than the maximum drawing cache size. ListView relies on the drawing
cache to correctly mask all the background pixels. However, if the cache
is not properly created, the background will show through even though
ListView.isOpaque() == true. This change detects this case and falls
back to the default non opaque behavior.

Change-Id: I30a45e7a03fb7ebb2b12f0e85c075c2901954c44