[ Merged of http://go/wvgerrit/16576 ]
The WV EXT-X-KEY attribute list earlier expected a cenc PSSH box in the
URI field, in a hexadecimal sequence format. To ease the burden on
content providers, the URI field will now contain init data in a json
format and base64 encoded. The platform will assume responsibility
to parse this data and create a widevine init data protobuf that
can be included in the license request.
b/20630275
Change-Id: I49e270bedbe96791fc9b282214a9a358d95d163e
77241489c3