David Aurelio 48c339ddc7 Add RCTJavaScriptWillStartExecutingNotification
Summary:
`RCTJavaScriptWillStartLoadingNotification` is being posted when starting the bridge, not when starting to execute JS code.

Here, we add `RCTJavaScriptWillStartExecutingNotification`, and in post it before executing JS with `RCTCxxBridge`.

Reviewed By: fromcelticpark

Differential Revision: D7153659

fbshipit-source-id: 902075308d54a47bef43b6f57edf2e624f621ceb
2018-03-06 11:05:25 -08:00
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