Follow up CL for import of GWT's benchmarks.
Follow up CL for import of GWT's benchmarks.

 - Make test more lenient on timing to remove flakiness
 - Remove BenchmarkCompiler.java which we do not need in g3
 - Rename v8 build macro to a shorter name
 - lower visibility of rules
 - Make rules simpler

Public=same
PiperOrigin-RevId: 165985352

google/j2cl,google/j2cl,google/j2cl,google/j2cl,google/j2cl