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Show bundle download progress on iOS
Summary: This shows progress for the download of the JS bundle (different from the packager transform progress that we show already). This is useful especially when loading the JS bundle from a remote source or when developing on device (on simulator + localhost it pretty much just downloads instantly). This will be nice for the expo client since all bundles are loaded over the network and can take several seconds to load. This depends on facebook/metro#28 to work but won't crash or anything without it, it just won't show the progress percentage. ![img_05070155d2cc-1](https://user-images.githubusercontent.com/2677334/28293828-2c08d974-6b24-11e7-9334-e106ef3326d9.jpeg) **Test plan** Tested that bundle download progress is shown properly in RNTester on both localhost + simulator and on real device with network conditionner to simulate a slow loading bundle. Tested that it doesn't cause issues if the packager doesn't send the Content-Length header. Closes #15066 Differential Revision: D5449073 Pulled By: shergin fbshipit-source-id: 43a8fb559393bbdc04f77916500e21898695bac5
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