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Sergei Dryganets 9024f56bda Fix crash due to mishandling of UTF-8 in progressive download.

Summary:
Fixes:
```
Fatal Exception: java.lang.RuntimeException: Failed to create String from JSON
       at com.facebook.react.bridge.queue.NativeRunnable.run(NativeRunnable.java)
       at android.os.Handler.handleCallback(Handler.java:739)
       at android.os.Handler.dispatchMessage(Handler.java:95)
       at com.facebook.react.bridge.queue.MessageQueueThreadHandler.dispatchMessage(MessageQueueThreadHandler.java:31)
       at android.os.Looper.loop(Looper.java:234)
       at com.facebook.react.bridge.queue.MessageQueueThreadImpl$3.run(MessageQueueThreadImpl.java:193)
       at java.lang.Thread.run(Thread.java:818)
```
JavaScriptCore is very strict about invalid UTF symbols.
So if you pass an invalid UTF-8 string to it the string will be decoded as an empty string.

The current implementation of progressive downloading for Android blindly cuts the response in 8KB chunks.
That could cause a problem in case the last symbol in the chunk is multi-byte.

To prevent it I added a class which determines if this is the case and cut the string in the appropriate place.
A remainder is prepended to the next chunk of data.

This should fix the root cause of this issue:
https://github.com/facebook/react-native/issues/10756
Closes https://github.com/facebook/react-native/pull/15295

Differential Revision: D6712570

Pulled By: hramos

fbshipit-source-id: f07fcf0f011c2133c8e860ceb0588a29d36d07fb

2018-01-12 11:10:04 -08:00