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Introduce ConvertPtr template that checks whether input is null.

Since ConvertPtr is a template we can test it with any valid type.

Bug: b:158658869
Change-Id: I78d5f7c984303cbd9e34b187c07e1f08a0a891eb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2273065
Commit-Queue: Oleh Lamzin <lamzin@google.com>
Reviewed-by: Mahmoud Gawad <mgawad@google.com>
Reviewed-by: Roland Bock <rbock@google.com>
Cr-Commit-Position: refs/heads/master@{#786203}