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Summary: The Android ImageEditingManager is inefficient and slow when cropping images. It loads the full resolution image into memory and then crops it. This leads to slow performance and occasional OutOfMemory Exceptions. [BitmapRegionDecoder](https://developer.android.com/reference/android/graphics/BitmapRegionDecoder.html) can be used to crop without needing to load the full resolution image into memory. Using it is much more efficient and much faster. Relevant issue: https://github.com/facebook/react-native/issues/10470 Attempt to crop a very large image (2000x2000) on Android. With this change, the crop should happen almost instantly. On the master branch, it should take 2-3 seconds (and might run out of memory). Please let me know if there's anything else I can provide. Closes https://github.com/facebook/react-native/pull/15439 Differential Revision: D5628223 Pulled By: shergin fbshipit-source-id: bf314e76134cd015380968ec4533225e724c4b26