Support searching by heap snapshot object id in Summary view

If user hits Ctrl+f and types "@number" in the search field when Summary view is shown we will find and highlight heap snapshot node whose id equals to the numbder.

BUG=255364

Review URL: https://codereview.chromium.org/69013002

git-svn-id: svn://svn.chromium.org/blink/trunk@161901 bbb929c8-8fbe-4397-9dbb-9b2b20218538