The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/6a0a09909f0f5bec51931c659da6acbf19dd2b17

commit 6a0a09909f0f5bec51931c659da6acbf19dd2b17
Author: Michael Lippautz <mlippautz@chromium.org>
Date: Thu Jan 10 18:42:58 2019

bindings: Update performance memory counters and expose legacy values

Legacy values are exposed via Origin Trial "Legacy Performance Memory
Counters", see details at
https://developers.chrome.com/origintrials/#/view_trial/2540030189836959745

Bug: 914304
Change-Id: If4bad6c4341ca7a05cf4f7c64c2850381f71b09a
Reviewed-on: https://chromium-review.googlesource.com/c/1373752
Reviewed-by: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#621664}
[modify] https://crrev.com/6a0a09909f0f5bec51931c659da6acbf19dd2b17/third_party/blink/renderer/core/timing/memory_info.cc
[modify] https://crrev.com/6a0a09909f0f5bec51931c659da6acbf19dd2b17/third_party/blink/renderer/core/timing/memory_info.h
[modify] https://crrev.com/6a0a09909f0f5bec51931c659da6acbf19dd2b17/third_party/blink/renderer/core/timing/memory_info.idl
[modify] https://crrev.com/6a0a09909f0f5bec51931c659da6acbf19dd2b17/third_party/blink/renderer/platform/runtime_enabled_features.json5
[add] https://crrev.com/6a0a09909f0f5bec51931c659da6acbf19dd2b17/third_party/blink/web_tests/http/tests/origin_trials/webexposed/legacy-performance-memory-counters-disabled.html
[add] https://crrev.com/6a0a09909f0f5bec51931c659da6acbf19dd2b17/third_party/blink/web_tests/http/tests/origin_trials/webexposed/legacy-performance-memory-counters-enabled.html