Support weak WebPrivatePtr<>s.
Parameterize WebPrivatePtr<> over the strength of the reference it maintains:
WebPtrivatePtr<T, crossThreadDestruction, strongOrWeak>
where
crossThreadDestruction = WebPrivatePtrDestruction{SameThread, CrossThread}
strongOrWeak = WebPrivatePtrStrength::{Normal, Weak}
If Normal, the reference is the normal strong kind, which means either
a RefPtr<> or a strong off-heap (CrossThread)Persistent<T> Oilpan reference.
If Weak, the Oilpan reference will be (CrossThread)WeakPersistent<T>, meaning
that the WebPrivatePtr<> will not keep the object alive on its own. Any
dereference of the WebPrivatePtr<> will consequently have to check if the
reference has been cleared before using.
The abstraction doesn't currently support weak non-Oilpan references.
R=
BUG=
Review URL: https://codereview.chromium.org/1618043003
Cr-Commit-Position: refs/heads/master@{#372324}
1 file changed
