Carlo Bernaschina e2b8d9e76b Avoid race condition into NotifyNextFrameOnce (flutter/engine#3980)
If GPURasterizer::NotifyNextFrameOnce was rapidly invoked twice could
have lead to a null pointer exception.

Also ftp::WeakPtr are not thread safe and should not be dereferenced
from other threads.
2017-08-15 14:35:16 -07:00
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