Improve debuggability of failed GCState transitions.

Make use of the call stack to help diagnose unexpected GCState transitions.

R=haraken
BUG=420515

Review URL: https://codereview.chromium.org/1007773002

git-svn-id: svn://svn.chromium.org/blink/trunk@191841 bbb929c8-8fbe-4397-9dbb-9b2b20218538
1 file changed
tree: f430040dc5f1fb9f90e8b491fceaae5854498a7d
  1. third_party/