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..a7f70659f34076e07dbc86a1b6ee42ee0fb68665 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(LibraryErrorsTaskTest);
   runReflectiveTests(LibraryUnitErrorsTaskTest);
   runReflectiveTests(ParseDartTaskTest);
   runReflectiveTests(ResolveUnitTypeNamesTaskTest);
@@ -1660,6 +1661,32 @@ f(A a) {
 }
 
 @reflectiveTest
+class LibraryErrorsTaskTest 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);
+    expect(task, new isInstanceOf<LibraryErrorsTask>());
+    expect(outputs, hasLength(1));
+    List<AnalysisError> errors = outputs[LIBRARY_ERRORS];
+    List<Source> errorSources = errors.map((_) => _.source).toList();
+    expect(errorSources, unorderedEquals([library, part1, part2]));
+  }
+}
+
+@reflectiveTest
 class LibraryUnitErrorsTaskTest extends _AbstractDartTaskTest {
   test_buildInputs() {
     Map<String, TaskInput> inputs = LibraryUnitErrorsTask