Do not Prepare raster cache if view_embedder is present (#11300)
Do not Prepare raster cache if view_embedder is present (#11300)

This is a perf win because we do not use the cache in Paint anyways.
RasterCache <-> PlatformViews interaction will be improved by:
https://github.com/flutter/flutter/issues/38903
jamesr/flutter_engine,cdotstout/sky_engine,jamesr/flutter_engine,Hixie/sky_engine,flutter/engine,flutter/engine,rmacnak-google/engine,cdotstout/sky_engine,flutter/engine,flutter/engine,aam/engine,cdotstout/sky_engine,chinmaygarde/sky_engine,aam/engine,mikejurka/engine,jason-simmons/sky_engine,jason-simmons/flutter_engine,aam/engine,rmacnak-google/engine,jason-simmons/flutter_engine,jamesr/flutter_engine,jason-simmons/sky_engine,jason-simmons/flutter_engine,jamesr/sky_engine,devoncarew/engine,aam/engine,mikejurka/engine,chinmaygarde/sky_engine,jamesr/flutter_engine,devoncarew/sky_engine,chinmaygarde/flutter_engine,cdotstout/sky_engine,Hixie/sky_engine,devoncarew/engine,chinmaygarde/sky_engine,jamesr/flutter_engine,tvolkert/engine,devoncarew/sky_engine,devoncarew/sky_engine,mikejurka/engine,jason-simmons/flutter_engine,jamesr/flutter_engine,jamesr/flutter_engine,Hixie/sky_engine,jason-simmons/flutter_engine,tvolkert/engine,jason-simmons/flutter_engine,Hixie/sky_engine,rmacnak-google/engine,devoncarew/sky_engine,cdotstout/sky_engine,tvolkert/engine,rmacnak-google/engine,mikejurka/engine,chinmaygarde/flutter_engine,jason-simmons/sky_engine,jason-simmons/flutter_engine,jamesr/flutter_engine,chinmaygarde/sky_engine,jamesr/sky_engine,chinmaygarde/sky_engine,tvolkert/engine,mikejurka/engine,mikejurka/engine,flutter/engine,jamesr/sky_engine,aam/engine,chinmaygarde/sky_engine,aam/engine,rmacnak-google/engine,cdotstout/sky_engine,jamesr/sky_engine,jason-simmons/sky_engine,devoncarew/engine,jamesr/sky_engine,chinmaygarde/sky_engine,jason-simmons/sky_engine,rmacnak-google/engine,jason-simmons/flutter_engine,rmacnak-google/engine,jamesr/sky_engine,chinmaygarde/flutter_engine,chinmaygarde/flutter_engine,jason-simmons/sky_engine,tvolkert/engine,aam/engine,jamesr/sky_engine,jason-simmons/sky_engine,aam/engine,Hixie/sky_engine,devoncarew/engine,flutter/engine,cdotstout/sky_engine,flutter/engine,devoncarew/sky_engine,chinmaygarde/flutter_engine,jamesr/flutter_engine,devoncarew/engine,Hixie/sky_engine,flutter/engine,Hixie/sky_engine,devoncarew/engine,devoncarew/engine,devoncarew/sky_engine,mikejurka/engine,Hixie/sky_engine,mikejurka/engine,chinmaygarde/flutter_engine,tvolkert/engine,tvolkert/engine,mikejurka/engine,devoncarew/sky_engine,chinmaygarde/flutter_engine