This is a merge from the Widevine repo of
http://go/wvgerrit/117311
Update backwards compatibility builds
http://go/wvgerrit/117423
Restrict maximum size of key id
To protect from out-of-memory found by fuzz testing.
http://go/wvgerrit/117683
Generation number should wrap
The master generation number should wrap around on overflow. This
means that we cannot use less than to check for a skew of 1.
http://go/wvgerrit/119232
Replace 0 with nullptr
Bug: 176234903
Bug: 184866351
Bug: 161243686
Test: ran unit tests (CL affects test code only)
Merged-In: Ie787bcf9c66a7605700c3dc29a8aa16406926ce3
Change-Id: I2b02a36a70a0920f31ffc00de102a23516d4b20e
830a7acc48