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Deduplicates the Skia Gold code used by the Android instrumentation
tests and the GPU Telemetry-based pixel tests, as they were effectively
identical with only a few differences. This is accomplished by moving
the majority of the code to //testing/skia_gold_common and having each
test harness extend the abstract classes as necessary.

Bug: 1093994
Change-Id: Icef9f22d896a82672f3c64a26d38c026bf6bd02d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2253147Reviewed-by: Tibor Goldschwendt <tiborg@chromium.org>
Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#781137}