Jason Simmons 64c99140bb Support hot and cold reload when using the APK asset provider on Android (flutter/engine#4746)
* deprecate snapshot_override, which is an obsolete predecessor of hot reload
* give the APKAssetProvider to the engine in the initial call to RunBundle
* later calls to Engine::RunBundleAndSource or Engine::SetAssetBundlePath
  will replace the APK asset provider with a DirectoryAssetBundle that uses
  the newly pushed assets
2018-03-06 10:40:19 -08:00
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