[macros] Fix basic macro compile with DDC, add e2e test.

The e2e test is for "how DDC is used in the language tests", more
realistic setupts to follow.

R=jakemac@google.com, nshahan@google.com

Change-Id: Iece44740d2e4d91748a7deef59f4e18ad42ac853
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/356241
Auto-Submit: Morgan :) <davidmorgan@google.com>
Commit-Queue: Morgan :) <davidmorgan@google.com>
Reviewed-by: Jake Macdonald <jakemac@google.com>
Reviewed-by: Nicholas Shahan <nshahan@google.com>

pkg/dev_compiler/lib/src/compiler/shared_command.dart

@@ -433,7 +433,7 @@ Map placeSourceMap(Map sourceMap, String sourceMapPath, String? multiRootScheme,
       return sourcePath;
     }
 
-    if (scheme == 'org-dartlang-augmentation') {
+    if (scheme.startsWith('dart-macro+')) {
       // TODO: https://github.com/dart-lang/sdk/issues/53913
       return sourcePath;
     }

tests/macro_build/ddc_lt_test.dart

@@ -0,0 +1,28 @@
+// Copyright (c) 2024, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'tester/tester.dart';
+
+void main() {
+  testMacroBuild([
+    r'$DART pub get',
+    r'$DART '
+        r'$DART_SDK_OUT/dart-sdk/bin/snapshots/dartdevc.dart.snapshot '
+        '-Dtest_runner.configuration=ddc-linux-chrome '
+        '--enable-experiment=macros '
+        '--sound-null-safety '
+        '-Dtest_runner.configuration=ddc-linux-chrome '
+        '--ignore-unrecognized-flags '
+        '--no-summarize '
+        '-o out.js '
+        'test/main.dart '
+        r'-s $DART_SDK_OUT/gen/utils/ddc/async_helper_outline.dill=async_helper '
+        r'-s $DART_SDK_OUT/gen/utils/ddc/expect_outline.dill=expect '
+        r'-s $DART_SDK_OUT/gen/utils/ddc/js_outline.dill=js '
+        r'-s $DART_SDK_OUT/gen/utils/ddc/meta_outline.dill=meta',
+    // Running out.js is nontrivial, just check if it contains the getter
+    // that the macro is supposed to add.
+    r'grep -q return$SPACE"OK" out.js',
+  ]);
+}

tests/macro_build/tester/tester.dart

@@ -73,7 +73,10 @@ runner to ensure they are built and not stale:
     final commandParts = command
         .replaceAll(r'$DART_SDK', dartSdkPath)
         .replaceAll(r'$DART', dartPath)
-        .split(' ');
+        .split(' ')
+        .map((c) => c.replaceAll(r'$SPACE', ' '))
+        .toList();
+
     print('Running: ${commandParts.join(' ')}');
     final process = await Process.start(
         commandParts.first, commandParts.skip(1).toList(),