Reland filesystem options support with fix for Windows test. (#15655)

* Revert "Revert "Reland pass filesystem options (#15622)" (#15651)"

This reverts commit 0f3eada0664e208bb8c65a5aa02daec38997e8b9.

* Fix for windows failing test

* !isEmpty -> isNotEmpty

packages/flutter_tools/lib/src/build_info.dart

diff --git a/packages/flutter_tools/lib/src/build_info.dart b/packages/flutter_tools/lib/src/build_info.dart
index c86d5b7..2f9cabf 100644
--- a/packages/flutter_tools/lib/src/build_info.dart
+++ b/packages/flutter_tools/lib/src/build_info.dart
@@ -17,6 +17,8 @@
     this.extraGenSnapshotOptions,
     this.preferSharedLibrary,
     this.targetPlatform,
+    this.fileSystemRoots,
+    this.fileSystemScheme,
   });
 
   final BuildMode mode;
@@ -32,6 +34,9 @@
   /// Whether build should be done using Dart2 Frontend parser.
   final bool previewDart2;
 
+  final List<String> fileSystemRoots;
+  final String fileSystemScheme;
+
   /// Whether the build should track widget creation locations.
   final bool trackWidgetCreation;