Revert "[test_runner] Invoke tests with relative paths."

This reverts commit b5294b9753.

Reason for revert: many failures on appjit, reload and fuchsia bots

Failure Link: <LINK TO FAILURE>

Original change's description:
> [test_runner] Invoke tests with relative paths.
>
> This makes tests more reproducible, and makes it easier to copy commands between workspaces, or between a failing bot and a local workspace.
>
> Change-Id: Ic8dd10a3540f314a406e5c5b0a23d97032e5d01d
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/508364
> Reviewed-by: Alexander Aprelev <aam@google.com>
> Commit-Queue: Ryan Macnak <rmacnak@google.com>

Change-Id: Id7aa668c0609df65a5f622ae73013a15e7f9200e
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/511400
Bot-Commit: rubber-stamper@appspot.gserviceaccount.com <rubber-stamper@appspot.gserviceaccount.com>
Reviewed-by: Alexander Aprelev <aam@google.com>
Reviewed-by: Nate Biggs <natebiggs@google.com>
Commit-Queue: Alexander Markov <alexmarkov@google.com>

pkg/test_runner/lib/src/command_output.dart

@@ -737,7 +737,9 @@ class AnalysisCommandOutput extends CommandOutput with _StaticErrorOutput {
       files.sort();
 
       for (var file in files) {
-        var path = Path(file!).toString();
+        var path = Path(
+          file!,
+        ).relativeTo(testCase.testFile.path.directoryPath).toString();
         output.subsection("unexpected analysis errors in $path");
 
         var errors = errorsByFile[file]!;

pkg/test_runner/lib/src/compiler_configuration.dart

@@ -1124,7 +1124,8 @@ class PrecompilerCompilerConfiguration extends CompilerConfiguration
     List<String> arguments,
     Map<String, String> environmentOverrides,
   ) {
-    var compareIl = 'pkg/vm/tool/compare_il$shellScriptExtension';
+    var pkgVmDir = Platform.script.resolve('../../../pkg/vm').toFilePath();
+    var compareIl = '$pkgVmDir/tool/compare_il$shellScriptExtension';
 
     var args = [
       arguments.firstWhere((arg) => arg.endsWith('_il_test.dart')),
@@ -1652,7 +1653,8 @@ abstract mixin class VMKernelCompilerMixin {
     List<String> arguments,
     Map<String, String> environmentOverrides,
   ) {
-    var genKernel = 'pkg/vm/tool/gen_kernel$shellScriptExtension';
+    var pkgVmDir = Platform.script.resolve('../../../pkg/vm').toFilePath();
+    var genKernel = '$pkgVmDir/tool/gen_kernel$shellScriptExtension';
 
     var kernelBinariesFolder = _configuration.buildDirectory;
     if (_useSdk) {
@@ -1682,10 +1684,10 @@ abstract mixin class VMKernelCompilerMixin {
             name.startsWith('--enable-experiment=') ||
             name.startsWith('--keep-class-names-implementing='),
       ),
-      if (isProductMode) '-Ddart.vm.product=true',
-      if (isAsan) '-Ddart.vm.asan=true',
-      if (isMsan) '-Ddart.vm.msan=true',
-      if (isTsan) '-Ddart.vm.tsan=true',
+      '-Ddart.vm.product=$isProductMode',
+      '-Ddart.vm.asan=$isAsan',
+      '-Ddart.vm.msan=$isMsan',
+      '-Ddart.vm.tsan=$isTsan',
       if (_enableAsserts ||
           arguments.contains('--enable-asserts') ||
           arguments.contains('--enable_asserts'))

pkg/test_runner/lib/src/configuration.dart

@@ -14,6 +14,7 @@ import 'compiler_configuration.dart';
 import 'deflake_info.dart';
 import 'feature.dart';
 import 'path.dart';
+import 'repository.dart';
 import 'runtime_configuration.dart';
 import 'testing_servers.dart';
 
@@ -72,7 +73,11 @@ class TestConfiguration {
     required this.reproducingArguments,
     this.fastTestsOnly = false,
     this.printPassingStdout = false,
-  }) : packages = packages ?? '.dart_tool/package_config.json';
+  }) : packages =
+           packages ??
+           Repository.uri
+               .resolve('.dart_tool/package_config.json')
+               .toFilePath();
 
   final Map<String, RegExp?> selectors;
   final Progress progress;

pkg/test_runner/lib/src/multitest.dart

@@ -360,5 +360,5 @@ Path _createMultitestDirectory(
       .append(_suiteNameFromPath(suiteDir))
       .join(relative);
   TestUtils.mkdirRecursive(Path.workingDirectory, path);
-  return path;
+  return Path(File(path.toNativePath()).absolute.path);
 }

pkg/test_runner/lib/src/test_file.dart

@@ -349,7 +349,7 @@ class TestFile extends _TestFileBase {
     // The analyzer package also uses a similar syntax for expectations, but
     // we don't want the test_runner to inadvertently think files containing
     // those are static error tests.
-    if (!filePath.replaceAll('\\', '/').contains('pkg/analyzer/')) {
+    if (!filePath.replaceAll('\\', '/').contains('/pkg/analyzer/')) {
       try {
         errorExpectations.addAll(_parseExpectations(filePath));
       } on FormatException catch (error) {

pkg/test_runner/lib/src/test_suite.dart

@@ -246,7 +246,7 @@ abstract class TestSuite {
     String dirname,
     Path testPath,
   ) {
-    var relative = testPath;
+    var relative = testPath.relativeTo(Repository.dir);
     relative = relative.directoryPath.append(relative.filenameWithoutExtension);
     var testUniqueName = TestUtils.getShortName(relative.toString());
 
@@ -257,7 +257,7 @@ abstract class TestSuite {
     TestUtils.mkdirRecursive(Path('.'), generatedTestPath);
     return File(
       generatedTestPath.toNativePath(),
-    ).path.replaceAll('\\', '/');
+    ).absolute.path.replaceAll('\\', '/');
   }
 
   /// Create a directories for generated assets (tests, html files,
@@ -393,7 +393,7 @@ class VMTestSuite extends TestSuite {
             configuration.architecture == Architecture.x64c
         ? '$buildDir/gen/kernel-service.dart.snapshot'
         : '$buildDir/gen/kernel_service.dill';
-    var dfePath = Path(filename).toNativePath();
+    var dfePath = Path(filename).absolute.toNativePath();
     final experiments = [...configuration.experiments];
     var args = [
       ...initialTargetArguments,
@@ -619,7 +619,7 @@ class StandardTestSuite extends TestSuite {
     bool recursive = false,
   }) : dartDir = Repository.dir,
        listRecursively = recursive,
-       suiteDir = suiteDirectory,
+       suiteDir = Repository.dir.join(suiteDirectory),
        extraVmOptions = configuration.vmOptions,
        super(configuration, suiteName, statusFilePaths) {
     // Initialize _dart2JsBootstrapDependencies.
@@ -1097,10 +1097,12 @@ class StandardTestSuite extends TestSuite {
       } else if (configuration.compiler == Compiler.ddc) {
         var ddcConfig =
             configuration.compilerConfiguration as DevCompilerConfiguration;
-        var nameFromModuleRoot = testFile.path;
+        var nameFromModuleRoot = testFile.path.relativeTo(Repository.dir);
         var nameFromModuleRootNoExt =
             "${nameFromModuleRoot.directoryPath}/$nameNoExt";
-        var jsDir = Path(compilationTempDir).toString();
+        var jsDir = Path(
+          compilationTempDir,
+        ).relativeTo(Repository.dir).toString();
         var nativeNonNullAsserts = testFile.ddcOptions.contains(
           '--native-null-assertions',
         );

pkg/test_runner/lib/src/testing_servers.dart

@@ -133,7 +133,7 @@ class TestingServers {
     int port = 0,
     int crossOriginPort = 0,
   }) async {
-    _packageConfig = await loadPackageConfigUri(Uri.base.resolveUri(_packages));
+    _packageConfig = await loadPackageConfigUri(_packages);
 
     _server = await _startHttpServer(host, port: port);
     await _startHttpServer(