Ben Konyi 6d5fce84ae Reland "Updated background execution implementation for Android" (flutter/engine#5954)
* Reland "Updated background execution implementation for Android" w/ JNI fixes for merge breakages

This reverts commit 4a12df930a9d0dc8db3410cd557f35f4a584dbd0.
2018-08-07 12:42:22 -07:00
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