Integrate pooled lambda with systrace.

Looper traces handler calls by calling Handler.getTraceName(), which when used with PooledLambda
ends up showing just:

"android.os.Handler: com.android.internal.util.function.pooled.PooledLambdaImpl"

That name doesn't help understand what's the real bottleneck, and even worse, could let people
think it's the PooledLambda who's causing it.

Which this change, it will display names like:

com.android.server.appop.AppOpsService$Lambda
com.android.server.wm$Lambda

Fixes: 141172840
Test: manual verification (neither PoolLambda nor Message have unit tests)

Change-Id: I80d2158a50a644b10f3724fb42a4a9c2aee63ae9