5984540f91
This bypasses any caching used on the display pipeline and is intended to be used by layers that want asynchronous decoding that fits well into the MozPromise style. This also fixes an issue with the frame count metadata decoder in the GIF decoder. The code only began being used with this patch, and the WPT exposed an overflow bug caused by not clearing nsGIFDecoder2::mColormap and nsGIFDecoder2::mColormapSize. Differential Revision: https://phabricator.services.mozilla.com/D212833
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https://firefox-source-docs.mozilla.org/contributing/contribution_quickref.html
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