GitLab

and destruction on a thread other than the one where the original
reference was created.

The problem with the current implementation is modifying the flag pointer
from WeakPtr::~WeakPtr which might happen on a different thread (potentially
racing with somebody invalidating the flag on the original thread).

For compatibility reasons, creating the initial reference attaches to the
thread and governs the thread-safety checking logic with respect to checking
a reference to be valid and invalidating it, which should both only be done
on the same thread.

BUG=82509
TEST=added unit tests

Added memleak suppression: http://crbug.com/94345

TBR=timurrrr@chromium.org

Review URL: http://codereview.chromium.org/7677028

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@98443 0039d316-1c4b-4281-b951-d872f2087c98