Dan Field 07849dc46c Parameterize upscaling for image decoding (flutter/engine#19067)
Adds an `allowUpscale` parameter to the Dart interfaces for instantiateImageCodec and decodeImageFromPIxels. If set to false, the image bounds will be clamped at their intrinsic dimensions.

A later commit will change the default to true.
2020-06-18 09:42:08 -07:00
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