Revert "Removed unused StandardTestSuite.cachedTests field"

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 c16dfaf4860daccee92574283165b0a671ea6e42..05d4f75c574be279152fdb41a710cee180f139f4 100644
--- a/tools/testing/dart/test_suite.dart
+++ b/tools/testing/dart/test_suite.dart
@@ -406,6 +406,7 @@ class StandardTestSuite extends TestSuite {
   final List<String> statusFilePaths;
   TestCaseEvent doTest;
   TestExpectations testExpectations;
+  List<TestInformation> cachedTests;
   final Path dartDir;
   Predicate<String> isTestFilePredicate;
   final bool listRecursively;
@@ -501,7 +502,7 @@ class StandardTestSuite extends TestSuite {
       // Checked if we have already found and generated the tests for
       // this suite.
       if (!testCache.containsKey(suiteName)) {
-        testCache[suiteName] = [];
+        cachedTests = testCache[suiteName] = [];
         return enqueueTests();
       } else {
         // We rely on enqueueing completing asynchronously.
@@ -624,8 +625,6 @@ class StandardTestSuite extends TestSuite {
     String testName;
 
     if (optionsFromFile['isMultitest']) {
-      // Multitests do not run on browsers.
-      if (TestUtils.isBrowserRuntime(configuration['runtime'])) return;
       // Multitests are in [build directory]/generated_tests/... .
       // The test name will be '[test filename (no extension)]/[multitest key].
       String name = filePath.filenameWithoutExtension;
@@ -802,6 +801,7 @@ class StandardTestSuite extends TestSuite {
                                      isNegativeIfChecked,
                                      hasFatalTypeErrors,
                                      multitestOutcome);
+      cachedTests.add(info);
       enqueueTestCaseFromTestInformation(info);
     };
   }