(This is a merge of http://go/wvgerrit/25581)
To prevent dead DRM Plugins from being instantiated when there are no
sessions available, the time at which the device ID is queried has been
moved from instantiation-time to SPOID-calculation-time.
SPOIDs can now fail to be generated. Which means anything that depends
on a SPOID may fail because of this. However, this is a more actionable
problem for apps than having them receive a dead or unusable DRM Plugin
object.
Bug: 36660726
Test: libwvdrmdrmplugin_hidl_test
Change-Id: Ice6a8eabfee8d48bf2af02e2e7169aa95af9f2e4
c0a7655834