Merge from Widevine repo http://go/wvgerrit/13818
This CL adds the ability to query OEMCrypto about the key control
block and duration of a key that has been loaded. There are unit
tests and implementation in the level 3 and reference implementation.
b/18503541
Change-Id: I8e40d90a3c64c1ce030af6fef9e98c8eac0df1a5
582eb32661