DevTools: [Console] schedule viewport refresh on console resize.

This patch schedules console viewport refresh on console view resize
event.

BUG=381547

Review URL: https://codereview.chromium.org/322723002

git-svn-id: svn://svn.chromium.org/blink/trunk@175757 bbb929c8-8fbe-4397-9dbb-9b2b20218538