Show live objects with given allocation call stack

When allocation stack trace is selected in the allocation view summary view underneath it is populated with information about live heap objects allocated with that stack trace.

BUG=277984
R=alph@chromium.org

Review URL: https://codereview.chromium.org/203403002

git-svn-id: svn://svn.chromium.org/blink/trunk@169451 bbb929c8-8fbe-4397-9dbb-9b2b20218538