Auto-rebaseline for r173439

http://src.chromium.org/viewvc/blink?view=revision&revision=173439

BUG=251960
TBR=danakj@chromium.org

Review URL: https://codereview.chromium.org/270543002

git-svn-id: svn://svn.chromium.org/blink/trunk@173449 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Expose performance.memory in workers, runtimeEnabledFeatures is used to control if real or quantized heap size info will be returned.

BUG=326370

Review URL: https://codereview.chromium.org/106353005

git-svn-id: svn://svn.chromium.org/blink/trunk@173450 bbb929c8-8fbe-4397-9dbb-9b2b20218538