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Use Apple's significant-change API (for iOS 11 UX)
Summary: In the yet-to-be-released iOS 11, Apple has changed the way they notify the user of location services. (You can watch their session from WWDC about all the changes [here](https://developer.apple.com/videos/play/wwdc2017/713/).) The current implementation of `RCTLocationObserver` uses the standard location services from Apple. When the user has granted `Always` location permission and the application uses the background location service, the user is presented with the *_Blue Bar of Shame_* (for more information check out [this blog post](https://blog.set.gl/ios-11-location-permissions-and-avoiding-the-blue-bar-of-shame-1cee6cd93bbe)): ![image](https://user-images.githubusercontent.com/15896334/28285133-281e425c-6af9-11e7-9177-61b879ab593c.png) * Added `useSignificantChanges` boolean to the options passed. * Added `_usingSignificantChanges` boolean based on user options. If `true`, then the CLLocationManager will use functions `startMonitoringSignificantLocationChanges`/ `stopMonitoringSignificantLocationChanges` rather than the standard location services. * Changed method signature of `beginLocationUpdatesWithDesiredAccuracy` to include `useSignificantChanges` flag * Added check for new `NSLocationAlwaysAndWhenInUseUsageDescription` All unit tests passed. Tested in simulator and on device, toggling `useSignificantChanges` option when calling `watchPosition`. Results were as expected. **When `TRUE`, the _Blue Bar of Shame_ was not present.** Changes do not affect Android and location services still work as expected on Android. * Change is for iOS only * Using a different API will have different accuracy results. Adding `useSignificantChanges` as an option was by design so apps that want to have most accurate and most frequent update can still use standard location services. Closes #15062 Differential Revision: D5443331 Pulled By: javache fbshipit-source-id: 0cf5b6cd831c5a7c8c25a5ddc2e410a9aa989bf4
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