DevTools: Simplify _assignParentsInProfile

Do not create extra objects while traversing.

R=yurys@chromium.org

Review URL: https://codereview.chromium.org/131103004

git-svn-id: svn://svn.chromium.org/blink/trunk@165530 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: operate single set of tokenizer types, do not patch mods in workers.

R=lushnikov@chromium.org

Review URL: https://codereview.chromium.org/134733018

git-svn-id: svn://svn.chromium.org/blink/trunk@165531 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Implement a runtime setting for deferred filter rendering. This will be plumbed through to a command-line flag in Chrome.

BUG=237641

Review URL: https://codereview.chromium.org/129873012

git-svn-id: svn://svn.chromium.org/blink/trunk@165532 bbb929c8-8fbe-4397-9dbb-9b2b20218538