Add presented_time to MTLDrawable

[grovesNL]

Rebased #300

GitHub closed the original PR automatically while I was rebasing the PR - probably because I was trying to push the new commit to the remote master and there's some kind of special handling for default branches

[MarijnS95]

GitHub closed the original PR automatically while I was rebasing the PR - probably because I was trying to push the new commit to the remote master and there's some kind of special handling for default branches

In hopes of helping you understand what happened:

1. Your force push at add presented_time to Drawable  #300 (comment), pushed the master of the fork, which the PR was created from, to be equal with the master of gfx-rs/metal-rs;
2. GitHub detects that there is no difference between the source branch and the master branch;
3. Hence assumes that everything was already merged into the target branch, and closes the PR.

You can sometimes recover from this by:

1. Force-pushing the original commit (before the force-push) to the PR source branch (i.e. git push -f https://github.com/marcpabst/metal-rs 3be029b:master in this case);
2. This makes GitHub show the "reopen pull request" button;
3. Then you can finally force-push the rebase, this time not just the master branch of gfx-rs/metal-rs but with the rebased/cherry-picked PR commit on top.

Hope that helps!

[grovesNL]

Thanks! The strange thing is that I did attempt to force push a local branch that was already rebased with the new commit on top. Maybe I was on the wrong local branch by mistake but I don't think so.

The tip about reopening it is good - I'll try that next time. I wasn't sure if it would let me do that because the PR itself was giving me push access to that remote.