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This CL adds a websocket performance test where client receives arrayuffer of 1 mega bytes 100 times.

Test:
$ cd third_party/blink/perf_tests/websocket
$ npm install
$ npm start
$ python ../../../../tools/perf/run_benchmark run blink_perf --browser=canary --test-path=websocket\receive-arraybuffer-1MBx100.html
or open the file directly on browser.

Rough result (avg ms of 6 runs) on Windows10, 28-core CPU of 2.6GHz:
  Chrome Canary(m75): 1709
  Canary w/o extension: 637
  FireFox: 338

Bug: 954000
Change-Id: Ica622aba18d57af2c97f11019588762544008d6d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1573436Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Reviewed-by: Hayato Ito <hayato@chromium.org>
Reviewed-by: Adam Rice <ricea@chromium.org>
Commit-Queue: Yoichi Osato <yoichio@chromium.org>
Cr-Commit-Position: refs/heads/master@{#653497}