Adam Ernst 39cb110c5b Add the ability to pre-create the JavaScript thread with RCTJSCExecutor
Summary: This can be used to create a JavaScript thread and `JSContext` in advance, then supply them to the `RCTJSCExecutor` at creation time later.

Reviewed By: javache

Differential Revision: D3534553

fbshipit-source-id: 99ccf711928cd12e84c9fbe142c6d19a7af55d07
2016-07-08 12:35:50 -07:00
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2016-07-04 09:28:27 -07:00