Add tracepoints for monitoring HWUI's (persistent) ShaderCache

We'd like to be able to determine from a perfetto trace whether shaders
are being evicted from HWUI's ShaderCache. Add tracepoints to check for
this or other errors when inserting into the cache.

Bug: 231194869
Bug: 225211273
Test: manual
Change-Id: Ib4059754da42984def059884987855e605497be0