Add LIBRARY_ERRORS result.

pkg/analyzer/test/src/task/dart_test.dart

Index: pkg/analyzer/test/src/task/dart_test.dart
diff --git a/pkg/analyzer/test/src/task/dart_test.dart b/pkg/analyzer/test/src/task/dart_test.dart
index d48469d000029ca5c5dc0ac84b46b703d860fa01..078367fea67f1573c64b89dd66a8d82a0f185cea 100644
--- a/pkg/analyzer/test/src/task/dart_test.dart
+++ b/pkg/analyzer/test/src/task/dart_test.dart
@@ -41,6 +41,7 @@ main() {
   runReflectiveTests(GatherUsedImportedElementsTaskTest);
   runReflectiveTests(GatherUsedLocalElementsTaskTest);
   runReflectiveTests(GenerateHintsTaskTest);
+  runReflectiveTests(LibraryErrorsReadyTaskTest);
   runReflectiveTests(LibraryUnitErrorsTaskTest);
   runReflectiveTests(ParseDartTaskTest);
   runReflectiveTests(ResolveUnitTypeNamesTaskTest);
@@ -1660,6 +1661,34 @@ f(A a) {
 }
 
 @reflectiveTest
+class LibraryErrorsReadyTaskTest extends _AbstractDartTaskTest {
+  test_perform() {
+    Source library = newSource('/lib.dart', r'''
+library lib;
+part 'part1.dart';
+part 'part2.dart';
+X v1;
+''');
+    Source part1 = newSource('/part1.dart', r'''
+part of lib;
+X v2;
+''');
+    Source part2 = newSource('/part2.dart', r'''
+part of lib;
+X v3;
+''');
+    _computeResult(library, LIBRARY_ERRORS_READY);
+    expect(task, new isInstanceOf<LibraryErrorsReadyTask>());
+    expect(outputs, hasLength(1));
+    bool ready = outputs[LIBRARY_ERRORS_READY];
+    expect(ready, isTrue);
+    expect(context.getErrors(library).errors, hasLength(1));
+    expect(context.getErrors(part1).errors, hasLength(1));
+    expect(context.getErrors(part2).errors, hasLength(1));
+  }
+}
+
+@reflectiveTest
 class LibraryUnitErrorsTaskTest extends _AbstractDartTaskTest {
   test_buildInputs() {
     Map<String, TaskInput> inputs = LibraryUnitErrorsTask