Ben Kwa 91430f1adf Reinstate mime icons on grid tiles. ...

- Add code to restore the mime icon on grid tiles (previously removed
  while tile layouts were being worked on).

- Switch mime icons from pngs to vector drawables.

BUG=24326989

Change-Id: I38b54256c6eca79052decadb6d138f658d03b951

2016-01-06 12:15:49 -08:00

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