Andrew Osmond c35d734095 Bug 1389988 - Handle a data race between a new sync decode request and a pending decoder. r=tnikkel
If there is an active provider which has yet to produce a frame, any
calls to SurfaceCache::Lookup will return MatchType::PENDING. If
RasterImage::Lookup gets the above result while given FLAG_SYNC_DECODE,
it will attempt to start a new decoder. It is entirely possible that
when we try to insert the new provider into the SurfaceCache, it cannot
because the original provider finally did produce something. In that
case we should abandon attempting to redecode and retry our lookup.
2018-02-09 08:51:28 -05:00
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