This makes nanobench picture recording benchmarks somewhat useful again,
as opposed to all taking about 5us to run no matter the content.
ATTN Sheriff: this will probably trigger perf.skia.org alerts.
BUG=skia:
Review URL: https://codereview.chromium.org/1219873002
Today we measure SkPicture playback speed, but not the time it takes to record
the SkPicture. This fixes that by reading SKPs from disk and re-recording them.
On the console, recording shows up first as the nonrendering skp benches,
followed later by the usual playback benches:
maxrss loops min median mean max stddev samples config bench
51M 2 165µs 168µs 169µs 178µs 3% ▆▄▃█▂▄▁▂▁▁ nonrendering tabl_slashdot.skp
57M 1 9.72ms 9.77ms 9.79ms 9.97ms 1% █▂▂▅▃▂▁▄▂▁ nonrendering desk_pokemonwiki.skp
57M 32 2.92µs 2.96µs 3.03µs 3.46µs 6% ▅▁▁▁▁▁▁█▂▁ nonrendering desk_yahoosports.skp
...
147M 1 3.86ms 3.87ms 3.97ms 4.81ms 7% █▁▁▁▁▁▁▁▁▁ 8888 tabl_slashdot.skp_1
147M 1 4.54ms 4.56ms 4.55ms 4.56ms 0% █▅▇▅█▅▂▁▅▁ 565 tabl_slashdot.skp_1
147M 2 3.08ms 3.24ms 4.17ms 8.18ms 50% █▁▁█▁▁▁▁▁▁ gpu tabl_slashdot.skp_1
147M 1 1.61ms 1.62ms 1.69ms 2.33ms 13% █▁▁▁▁▁▁▁▁▁ 8888 desk_pokemonwiki.skp_1
147M 1 1.44ms 1.44ms 1.45ms 1.47ms 1% ▅▂█▂▂▅▁▁▂▁ 565 desk_pokemonwiki.skp_1
...
On skiaperf.com, they'll also be separated out from playback benches by bench_type.
BUG=skia:
R=reed@google.com, mtklein@google.com, jcgregorio@google.com
Author: mtklein@chromium.org
Review URL: https://codereview.chromium.org/559153002
