[rshest]

Summary:
[Changelog][Internal]

Guard call to the C++ ReadableNAtiveMap.importValues with a lock.

Note that all the occurrences in this class (together with importTypes) already were protected by a lock, except of this one, which with the very high chance caused crashes in T145271136.

My corresponding comment from the task, for justification:

If callstack to be trusted, the crash happens on the C++ side, in ReadableNativeMap::importValues().
It throws ArrayIndexOutOfBoundsException, which, looking at the code, seems to be only possible due to a corrupted data or race conditions.

Now, looking at the Java side of ReadableNativeMap, and the particular call site... it's very dodgy, since all other occurrences of calling to native importTypes/importValues are guarded by locks, but the one crashing isn't.

NOTE: A couple of importKeys() instances appears to suffer from the same problem as well.

Reviewed By: javache

Differential Revision: D43398416