[fuchsia_tester] Plumb through the location of icudtl (#30218)

packages/flutter_tools/bin/fuchsia_tester.dart

@@ -99,8 +99,7 @@ Future<void> run(List<String> args) async {
         fs.link(artifacts.getArtifactPath(Artifact.flutterTester));
     testerDestLink.parent.createSync(recursive: true);
     testerDestLink.createSync(fs.path.absolute(shellPath));
-    final Link icudtlLink = testerDestLink.parent.childLink('icudtl.dat');
-    icudtlLink.createSync(fs.path.absolute(argResults[_kOptionIcudtl]));
+
     final Directory sdkRootDest =
         fs.directory(artifacts.getArtifactPath(Artifact.flutterPatchedSdkPath));
     sdkRootDest.createSync(recursive: true);
@@ -141,6 +140,7 @@ Future<void> run(List<String> args) async {
       enableObservatory: collector != null,
       precompiledDillFiles: tests,
       concurrency: math.max(1, platform.numberOfProcessors - 2),
+      icudtlPath: fs.path.absolute(argResults[_kOptionIcudtl]),
     );
 
     if (collector != null) {

packages/flutter_tools/lib/src/test/flutter_platform.dart

@@ -92,6 +92,7 @@ void installHook({
   InternetAddressType serverType = InternetAddressType.IPv4,
   Uri projectRootDirectory,
   FlutterProject flutterProject,
+  String icudtlPath,
 }) {
   assert(enableObservatory || (!startPaused && observatoryPort == null));
   hack.registerPlatformPlugin(
@@ -111,6 +112,7 @@ void installHook({
       updateGoldens: updateGoldens,
       projectRootDirectory: projectRootDirectory,
       flutterProject: flutterProject,
+      icudtlPath: icudtlPath,
     ),
   );
 }
@@ -390,6 +392,7 @@ class _FlutterPlatform extends PlatformPlugin {
     this.updateGoldens,
     this.projectRootDirectory,
     this.flutterProject,
+    this.icudtlPath,
   }) : assert(shellPath != null);
 
   final String shellPath;
@@ -406,6 +409,7 @@ class _FlutterPlatform extends PlatformPlugin {
   final bool updateGoldens;
   final Uri projectRootDirectory;
   final FlutterProject flutterProject;
+  final String icudtlPath;
 
   Directory fontsDirectory;
   _Compiler compiler;
@@ -952,6 +956,10 @@ class _FlutterPlatform extends PlatformPlugin {
       command.add('--ipv6');
     }
 
+    if (icudtlPath != null) {
+      command.add('--icu-data-file-path=$icudtlPath');
+    }
+
     command.addAll(<String>[
       '--enable-checked-mode',
       '--verify-entry-points',

packages/flutter_tools/lib/src/test/runner.dart

@@ -36,6 +36,7 @@ Future<int> runTests(
   TestWatcher watcher,
   @required int concurrency,
   FlutterProject flutterProject,
+  String icudtlPath,
 }) async {
   // Compute the command-line arguments for package:test.
   final List<String> testArgs = <String>[];
@@ -83,6 +84,7 @@ Future<int> runTests(
     updateGoldens: updateGoldens,
     projectRootDirectory: fs.currentDirectory.uri,
     flutterProject: flutterProject,
+    icudtlPath: icudtlPath,
   );
 
   // Make the global packages path absolute.