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Most of the code is copied from perf_tests/paint/select-all-words.html

Change-Id: I3d231a67f8162ac3145f070df38875de1a72dfa1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2321233
Commit-Queue: Koji Ishii <kojii@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Reviewed-by: Philip Rogers <pdr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792147}