Start implementing checked mode compile time errors in analyzer.

tools/testing/dart/test_runner.dart

Index: tools/testing/dart/test_runner.dart
diff --git a/tools/testing/dart/test_runner.dart b/tools/testing/dart/test_runner.dart
index 35d6613b154389d847b91fcf68d146a702f284d7..b88381e0c4fb5d9295eecfa006531e6aef9a5efd 100644
--- a/tools/testing/dart/test_runner.dart
+++ b/tools/testing/dart/test_runner.dart
@@ -1441,9 +1441,7 @@ class AnalysisCommandOutputImpl extends CommandOutputImpl {
     parseAnalyzerOutput(errors, warnings);
 
     // Handle errors / missing errors
-    if (testCase.hasCompileError) {
-      // Don't use [TestCase.expectCompileError] since the analyzer does not
-      // (currently) report checked-mode only compile time errors.
+    if (testCase.expectCompileError) {
       if (errors.length > 0) {
         return Expectation.PASS;
       }