[flutter_tools] allow configuring libraries spec path for the web compilation (#51590)

packages/flutter_tools/lib/src/artifacts.dart

@@ -40,6 +40,7 @@ enum Artifact {
   kernelWorkerSnapshot,
   /// The root of the web implementation of the dart SDK.
   flutterWebSdk,
+  flutterWebLibrariesJson,
   /// The summary dill for the dartdevc target.
   webPlatformKernelDill,
   iosDeploy,
@@ -134,6 +135,8 @@ String _artifactToFileName(Artifact artifact, [ TargetPlatform platform, BuildMo
       return 'font-subset$exe';
     case Artifact.constFinder:
       return 'const_finder.dart.snapshot';
+    case Artifact.flutterWebLibrariesJson:
+      return 'libraries.json';
   }
   assert(false, 'Invalid artifact $artifact.');
   return null;
@@ -333,6 +336,8 @@ class CachedArtifacts extends Artifacts {
         return _getFlutterPatchedSdkPath(mode);
       case Artifact.flutterWebSdk:
         return _getFlutterWebSdkPath();
+      case Artifact.flutterWebLibrariesJson:
+        return _fileSystem.path.join(_getFlutterWebSdkPath(), _artifactToFileName(artifact));
       case Artifact.webPlatformKernelDill:
         return _fileSystem.path.join(_getFlutterWebSdkPath(), 'kernel', _artifactToFileName(artifact));
       case Artifact.dart2jsSnapshot:
@@ -536,6 +541,8 @@ class LocalEngineArtifacts extends Artifacts {
         return _fileSystem.path.join(_hostEngineOutPath, artifactFileName);
       case Artifact.constFinder:
         return _fileSystem.path.join(_hostEngineOutPath, 'gen', artifactFileName);
+      case Artifact.flutterWebLibrariesJson:
+        return _fileSystem.path.join(_getFlutterWebSdkPath(), artifactFileName);
     }
     assert(false, 'Invalid artifact $artifact.');
     return null;

packages/flutter_tools/lib/src/compile.dart

@@ -462,6 +462,7 @@ abstract class ResidentCompiler {
     List<String> experimentalFlags,
     String platformDill,
     List<String> dartDefines,
+    String librariesSpec,
   }) = DefaultResidentCompiler;
 
   // TODO(jonahwilliams): find a better way to configure additional file system
@@ -526,6 +527,7 @@ class DefaultResidentCompiler implements ResidentCompiler {
     this.experimentalFlags,
     this.platformDill,
     List<String> dartDefines,
+    this.librariesSpec,
   }) : assert(sdkRoot != null),
        _stdoutHandler = StdoutHandler(consumer: compilerMessageConsumer),
        dartDefines = dartDefines ?? const <String>[],
@@ -542,6 +544,7 @@ class DefaultResidentCompiler implements ResidentCompiler {
   final bool unsafePackageSerialization;
   final List<String> experimentalFlags;
   final List<String> dartDefines;
+  final String librariesSpec;
 
   @override
   void addFileSystemRoot(String root) {
@@ -664,6 +667,10 @@ class DefaultResidentCompiler implements ResidentCompiler {
         '--output-dill',
         outputPath,
       ],
+      if (librariesSpec != null) ...<String>[
+        '--libraries-spec',
+        librariesSpec,
+      ],
       if (packagesFilePath != null) ...<String>[
         '--packages',
         packagesFilePath,

packages/flutter_tools/lib/src/resident_runner.dart

@@ -94,6 +94,8 @@ class FlutterDevice {
           .getArtifactPath(Artifact.webPlatformKernelDill, mode: buildMode))
           .absolute.uri.toString(),
         dartDefines: dartDefines,
+        librariesSpec: globals.fs.file(globals.artifacts
+          .getArtifactPath(Artifact.flutterWebLibrariesJson)).uri.toString()
       );
     } else {
       generator = ResidentCompiler(

packages/flutter_tools/test/general.shard/resident_runner_test.dart

@@ -688,6 +688,9 @@ void main() {
       trackWidgetCreation: true,
     )).generator as DefaultResidentCompiler;
 
+    expect(residentCompiler.librariesSpec,
+      globals.fs.file(globals.artifacts.getArtifactPath(Artifact.flutterWebLibrariesJson))
+        .uri.toString());
     expect(residentCompiler.targetModel, TargetModel.dartdevc);
     expect(residentCompiler.sdkRoot,
       globals.artifacts.getArtifactPath(Artifact.flutterWebSdk, mode: BuildMode.debug) + '/');