8666e1af8f
In http://review.skia.org/689016, Skia added an option to explicitly
register codecs to use (instead of relying on #defines set by BUILD.gn
rules.
This uses that mechanism to explicitly register all the codecs that
Flutter was currently using from Skia (at least by my read of
[tools/gn](fee0534882/tools/gn (L292)).
I'm not sure if there is another place I need to put this sort of code,
e.g. for Fuchsia things.
To really test this out, we would want to add a define of
SK_DISABLE_LEGACY_INIT_DECODERS when compiling Skia, but I'm not sure
the best place to do this.
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