DevTools: Allow pinning lossless objects printed to console.

For non-lossless it already works via ObjectPropertiesSection.
We should do the same for lossless objects.

BUG=327109
R=pfeldman

Review URL: https://codereview.chromium.org/288223002

git-svn-id: svn://svn.chromium.org/blink/trunk@174086 bbb929c8-8fbe-4397-9dbb-9b2b20218538