[dyn-modules] fix ddc test runner in windows

Windows paths of the form `c:` are parsed incorrectly by the
subprocesses actions when reading the package path. This change ensures
they are encoded as `file:` URIs instead to ensure they are parsed
properly.

Fixes https://github.com/dart-lang/sdk/issues/56725

TESTED=dynamic_modules_suite

Change-Id: Iadcfc8bf08b8845620dcf2be5fafadb975a8edc2
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/397180
Reviewed-by: Nate Biggs <natebiggs@google.com>
Commit-Queue: Sigmund Cherem <sigmund@google.com>

pkg/dynamic_modules/test/runner/ddc.dart

@@ -76,7 +76,7 @@ class DdcExecutor implements TargetExecutor {
       '$ddcSdkOutline',
       // Note: this needs to change if we ever intend to support packages within
       // the dynamic loading tests themselves
-      '--packages=${repoRoot.toFilePath()}/.dart_tool/package_config.json',
+      '--packages=$repoRoot/.dart_tool/package_config.json',
       if (!isMain) ...[
         // TODO(sigmund): consider specifying the module name directly
         '--dynamic-module',
@@ -95,7 +95,7 @@ class DdcExecutor implements TargetExecutor {
     var testDir = _tmp.uri.resolve(testName).toFilePath();
     var args = [
       '--packages=${repoRoot.toFilePath()}/.dart_tool/package_config.json',
-      kernelWOrkerAotSnapshot.toFilePath(),
+      kernelWorkerAotSnapshot.toFilePath(),
       '--summary-only',
       '--target',
       'ddc',
@@ -103,7 +103,7 @@ class DdcExecutor implements TargetExecutor {
       '${sourceDir.resolve('../../')}',
       '--multi-root-scheme',
       rootScheme,
-      '--packages-file=${repoRoot.toFilePath()}/.dart_tool/package_config.json',
+      '--packages-file=$repoRoot/.dart_tool/package_config.json',
       '--dart-sdk-summary',
       '$ddcSdkOutline',
       '--source',
@@ -142,12 +142,13 @@ class DdcExecutor implements TargetExecutor {
     var testDir = _tmp.uri.resolve('${test.name}/');
     var bootstrapUri = testDir.resolve('bootstrap.js');
     // TODO(sigmund): remove hardwired entrypoint name
+    String toPath(Uri uri) => uri.toFilePath().replaceAll('\\', '\\\\');
     File.fromUri(bootstrapUri).writeAsStringSync('''
-      load('${ddcPreamblesJs.toFilePath()}');        // preambles/d8.js
-      load('${ddcSealNativeObjectJs.toFilePath()}'); // seal_native_object.js
-      load('${ddcModuleLoaderJs.toFilePath()}');     // ddc_module_loader.js
-      load('${ddcSdkJs.toFilePath()}');              // dart_sdk.js
-      load('main.dart.js');                          // compiled test module
+      load('${toPath(ddcPreamblesJs)}');        // preambles/d8.js
+      load('${toPath(ddcSealNativeObjectJs)}'); // seal_native_object.js
+      load('${toPath(ddcModuleLoaderJs)}');     // ddc_module_loader.js
+      load('${toPath(ddcSdkJs)}');              // dart_sdk.js
+      load('main.dart.js');                     // compiled test module
 
       self.dartMainRunner(function () {
         dart_library.configure(

pkg/dynamic_modules/test/runner/util.dart

@@ -68,7 +68,7 @@ Uri _dartBin = Uri.file(Platform.resolvedExecutable);
 Uri dartAotBin = _dartBin
     .resolve(Platform.isWindows ? 'dartaotruntime.exe' : 'dartaotruntime');
 Uri ddcAotSnapshot = _dartBin.resolve('snapshots/dartdevc_aot.dart.snapshot');
-Uri kernelWOrkerAotSnapshot =
+Uri kernelWorkerAotSnapshot =
     _dartBin.resolve('snapshots/kernel_worker_aot.dart.snapshot');
 Uri buildRootUri = repoRoot.resolve(buildFolder);
 Uri ddcSdkOutline = buildRootUri.resolve('ddc_outline.dill');