am e8543418: Merge change I7c0d20a7 into eclair

Merge commit 'e8543418783f8f8f9a6bafdaa1dd6289661eac85' into eclair-plus-aosp

* commit 'e8543418783f8f8f9a6bafdaa1dd6289661eac85':
  Run the metadataretriever at background priority. Bug 2187133.