am 6d7a2d3e: Merge changes Ia9b2ced0,I7cccfffc into gb-ub-photos-bryce

* commit '6d7a2d3e32a27de28336176f856a7439b36252bd':
  Class to simplify use of GalleryBitmapPool for decoding Bitmaps.
  Allow prefetch for cache, reducing priority for prefetched images.
tree: 9e8dc7f7387ebebcf45e198b2106f98c97a48909
  1. gallerycommon/
  2. jni_mosaic/
  3. src/
  4. src_pd/
  5. tests/
  6. tests_camera/