LogBox - Errors thrown in render are fatals

Summary:
The React team wants exceptions thrown during render to pop over the screen as fatals.

Changelog: [Internal]

Reviewed By: motiz88

Differential Revision: D18439258

fbshipit-source-id: dded7b9d93271c1a4eff682be521c7567dfe7d7e

Libraries/Core/Devtools/parseErrorStack.js

@@ -17,6 +17,7 @@ export type ExtendedError = Error & {
   preventSymbolication?: boolean,
   componentStack?: string,
   forceRedbox?: boolean,
+  isComponentError?: boolean,
 };
 
 function parseErrorStack(e: ExtendedError): Array<StackFrame> {