Retrieve the last error from the proper thread (#3649)
Retrieve the last error from the proper thread (#3649)

Previously, the last error was a global static. Now it is a thread-specific
value, which means we need to visit the UI thread to read the value.
flutter/engine,devoncarew/engine,jamesr/sky_engine,rmacnak-google/engine,Hixie/sky_engine,jamesr/flutter_engine,aam/engine,krisgiesing/sky_engine,chinmaygarde/flutter_engine,tvolkert/engine,jason-simmons/sky_engine,jamesr/sky_engine,rmacnak-google/engine,aam/engine,rmacnak-google/engine,krisgiesing/sky_engine,devoncarew/engine,jamesr/flutter_engine,jason-simmons/flutter_engine,devoncarew/engine,krisgiesing/sky_engine,jamesr/sky_engine,jamesr/sky_engine,jamesr/flutter_engine,devoncarew/engine,jason-simmons/sky_engine,rmacnak-google/engine,devoncarew/sky_engine,chinmaygarde/sky_engine,jason-simmons/flutter_engine,mikejurka/engine,flutter/engine,chinmaygarde/sky_engine,jamesr/flutter_engine,aam/engine,tvolkert/engine,chinmaygarde/sky_engine,jamesr/sky_engine,cdotstout/sky_engine,jason-simmons/sky_engine,chinmaygarde/flutter_engine,chinmaygarde/flutter_engine,mikejurka/engine,devoncarew/sky_engine,jason-simmons/sky_engine,jason-simmons/sky_engine,flutter/engine,flutter/engine,jason-simmons/flutter_engine,jamesr/flutter_engine,mikejurka/engine,jason-simmons/sky_engine,jason-simmons/sky_engine,jamesr/flutter_engine,jason-simmons/flutter_engine,flutter/engine,Hixie/sky_engine,mikejurka/engine,cdotstout/sky_engine,jason-simmons/flutter_engine,flutter/engine,Hixie/sky_engine,Hixie/sky_engine,cdotstout/sky_engine,cdotstout/sky_engine,rmacnak-google/engine,krisgiesing/sky_engine,devoncarew/sky_engine,tvolkert/engine,chinmaygarde/sky_engine,chinmaygarde/flutter_engine,cdotstout/sky_engine,tvolkert/engine,devoncarew/sky_engine,jason-simmons/flutter_engine,mikejurka/engine,flutter/engine,jason-simmons/flutter_engine,rmacnak-google/engine,chinmaygarde/flutter_engine,devoncarew/sky_engine,tvolkert/engine,jamesr/flutter_engine,aam/engine,chinmaygarde/sky_engine,krisgiesing/sky_engine,krisgiesing/sky_engine,cdotstout/sky_engine,devoncarew/engine,jamesr/sky_engine,devoncarew/sky_engine,chinmaygarde/sky_engine,devoncarew/engine,rmacnak-google/engine,chinmaygarde/flutter_engine,flutter/engine,aam/engine,aam/engine,mikejurka/engine,mikejurka/engine,mikejurka/engine,krisgiesing/sky_engine,Hixie/sky_engine,jamesr/flutter_engine,cdotstout/sky_engine,aam/engine,mikejurka/engine,jamesr/flutter_engine,tvolkert/engine,jason-simmons/flutter_engine,chinmaygarde/sky_engine,chinmaygarde/flutter_engine,Hixie/sky_engine,jamesr/sky_engine,Hixie/sky_engine,aam/engine,devoncarew/engine,devoncarew/sky_engine,Hixie/sky_engine,tvolkert/engine