DevTools: Fix batch updates dropping methods invocations.

Do not skip method invocations inside requestAnimationFrame
when it has entered a new batch sequence. Otherwise the scheduled
method invocations get lost.

Review URL: https://codereview.chromium.org/213833016

git-svn-id: svn://svn.chromium.org/blink/trunk@170566 bbb929c8-8fbe-4397-9dbb-9b2b20218538