DisplayViewport::uniqueId is now std::string, so change the calls
appropriately. Do some additional cleanups and conversions.
This almost completely removes the dependency on String8.
Test: build only
Bug: 111108021
Change-Id: Ibbb6ca59e9061954d4a5fb930ef03d42cb0230db
This is a multiproject change as we need to both the libraries
themselves as well as those that had dependencies on libskia.so
Bug: 31971097
Test: compile only
Change-Id: Ie6ff1f4682d03289205f4d6048cde9f95c61a90f