Add dart_product binary

tools/testing/dart/test_suite.dart

Index: tools/testing/dart/test_suite.dart
diff --git a/tools/testing/dart/test_suite.dart b/tools/testing/dart/test_suite.dart
index ed354d2578df578f2987074726a26c16339381b9..7ace9d8c7a6fa45e9b3cc7726601d73848b836bf 100644
--- a/tools/testing/dart/test_suite.dart
+++ b/tools/testing/dart/test_suite.dart
@@ -240,6 +240,21 @@ abstract class TestSuite {
     return dartExecutable;
   }
 
+  String get dartVmProductBinaryFileName {
+    // Controlled by user with the option "--dart".
+    String dartExecutable = configuration['dart'];
+
+    if (dartExecutable == '') {
+      String suffix = executableBinarySuffix;
+      dartExecutable = useSdk
+          ? '$buildDir/dart-sdk/bin/dart_product$suffix'
+          : '$buildDir/dart_product$suffix';
+    }
+
+    TestUtils.ensureExists(dartExecutable, configuration);
+    return dartExecutable;
+  }
+
   String get d8FileName {
     var suffix = getExecutableSuffix('d8');
     var d8Dir = TestUtils.dartDir.append('third_party/d8');