Enable consts from environment in DDK for flutter_web (#10069)
Enable consts from environment in DDK for flutter_web (#10069)

Fixes: https://github.com/dart-lang/sdk/issues/37605

We were seeing unevaluated constants during the build for flutter_web. Passing an empty map is handled differently than null so the constant evaluation will kick in.
jamesr/flutter_engine,cdotstout/sky_engine,flutter/engine,devoncarew/sky_engine,rmacnak-google/engine,aam/engine,chinmaygarde/sky_engine,rmacnak-google/engine,jamesr/sky_engine,cdotstout/sky_engine,cdotstout/sky_engine,Hixie/sky_engine,mikejurka/engine,jason-simmons/sky_engine,devoncarew/sky_engine,devoncarew/engine,jamesr/flutter_engine,devoncarew/engine,mikejurka/engine,chinmaygarde/sky_engine,flutter/engine,jamesr/flutter_engine,jason-simmons/flutter_engine,devoncarew/engine,devoncarew/sky_engine,flutter/engine,rmacnak-google/engine,tvolkert/engine,rmacnak-google/engine,jamesr/flutter_engine,chinmaygarde/flutter_engine,jason-simmons/sky_engine,devoncarew/engine,devoncarew/engine,chinmaygarde/flutter_engine,cdotstout/sky_engine,aam/engine,jamesr/sky_engine,tvolkert/engine,aam/engine,jamesr/sky_engine,devoncarew/sky_engine,aam/engine,aam/engine,aam/engine,cdotstout/sky_engine,jason-simmons/sky_engine,cdotstout/sky_engine,rmacnak-google/engine,jason-simmons/flutter_engine,jason-simmons/flutter_engine,devoncarew/sky_engine,jason-simmons/sky_engine,jamesr/flutter_engine,mikejurka/engine,jason-simmons/sky_engine,flutter/engine,jamesr/sky_engine,mikejurka/engine,jamesr/sky_engine,mikejurka/engine,jason-simmons/flutter_engine,cdotstout/sky_engine,chinmaygarde/flutter_engine,flutter/engine,Hixie/sky_engine,Hixie/sky_engine,jamesr/sky_engine,tvolkert/engine,jamesr/flutter_engine,Hixie/sky_engine,jamesr/flutter_engine,chinmaygarde/sky_engine,flutter/engine,aam/engine,jason-simmons/flutter_engine,tvolkert/engine,chinmaygarde/sky_engine,devoncarew/engine,devoncarew/sky_engine,flutter/engine,jason-simmons/sky_engine,flutter/engine,devoncarew/engine,chinmaygarde/sky_engine,aam/engine,rmacnak-google/engine,mikejurka/engine,jamesr/flutter_engine,Hixie/sky_engine,chinmaygarde/flutter_engine,jamesr/flutter_engine,tvolkert/engine,tvolkert/engine,chinmaygarde/flutter_engine,jason-simmons/flutter_engine,Hixie/sky_engine,devoncarew/sky_engine,Hixie/sky_engine,jason-simmons/sky_engine,chinmaygarde/sky_engine,Hixie/sky_engine,chinmaygarde/sky_engine,tvolkert/engine,mikejurka/engine,jason-simmons/flutter_engine,mikejurka/engine,jamesr/sky_engine,jason-simmons/flutter_engine,chinmaygarde/flutter_engine,mikejurka/engine,rmacnak-google/engine,chinmaygarde/flutter_engine