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Previously they were not checking whether they were running on the
expected GPU (low-power or high-performance). In fact, they were
accidentally misconfigured in test_suites.pyl, and were not exercising
the desired code paths on the bots.

Stop forcing the discrete GPU when running the pixel tests - allow
them to use the natural GPU configuration of the browser - and make
assertions about which GPU is active at various points during the
low-to-high-power and high-to-low-power tests.

Bug: 1047573
Change-Id: Icdb85c6fe2625ccce489f8bba4c053f5248e1e55
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2032190
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Reviewed-by: James Darpinian <jdarpinian@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738051}