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The LapTimer in RendererPerfTest is initialized from a command line
flag, but the LapTimer in SurfaceAggregatorPerfTest is only default
constructed.

Move LapTimer initialization to a VizPerfTest superclass to unify the
setup logic.

Bug: 1154343
Change-Id: I6fd02b26396368b82d3f1360129ef5f38c1a2c7d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2567625
Commit-Queue: Sean Gilhuly <sgilhuly@chromium.org>
Reviewed-by: kylechar <kylechar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833303}