DevTools: limit number of crumbs strip layouts during the update to 3.

R=aandrey@chromium.org, apavlov@chromium.org

Review URL: https://codereview.chromium.org/208843006

git-svn-id: svn://svn.chromium.org/blink/trunk@169943 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Replace the Persistent in SQLiteDatabase with a member and trace it.

R=tkent@chromium.org
BUG=

Review URL: https://codereview.chromium.org/204543005

git-svn-id: svn://svn.chromium.org/blink/trunk@169944 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Oilpan: Move CSSAnimationData and CSSAnimationDataList to oilpan's heap

BUG=341032

Review URL: https://codereview.chromium.org/207683005

git-svn-id: svn://svn.chromium.org/blink/trunk@169945 bbb929c8-8fbe-4397-9dbb-9b2b20218538