[VRR] Fix trace begin/end in ViewRootImpl

Fixes: 339159134

There are a few cases where a Trace.traceEnd() can be
called without a Trace.traceBegin() being called. This
CL fixes those places in ViewRootImpl.

Test: ran broken test
Change-Id: I97cebb016070717dbe8bad53755df9d2f8baca50