Oilpan: have PromiseTracker callback keep a WeakPersistent<>.

For the v8 callback objects that PromiseTrackers create, insist on using
a WeakPersistent<> back reference to the PromiseTracker when Oilpan
is enabled.

R=haraken
BUG=340522

Review URL: https://codereview.chromium.org/1301253002

git-svn-id: svn://svn.chromium.org/blink/trunk@200963 bbb929c8-8fbe-4397-9dbb-9b2b20218538
2 files changed
tree: f648da0a295d0907ad331c37c206aeae7e22a02f
  1. third_party/