Fix "reanalyze sources" when there are unsaved files.

pkg/analysis_server/test/analysis/reanalyze_test.dart

Index: pkg/analysis_server/test/analysis/reanalyze_test.dart
diff --git a/pkg/analysis_server/test/analysis/reanalyze_test.dart b/pkg/analysis_server/test/analysis/reanalyze_test.dart
index cd3cd0b74d3410c0733355f0506c124705daa0f6..c2c60af0028f0a47106e15ab4efeb2deb4d62c36 100644
--- a/pkg/analysis_server/test/analysis/reanalyze_test.dart
+++ b/pkg/analysis_server/test/analysis/reanalyze_test.dart
@@ -21,6 +21,16 @@ main() {
 
 @reflectiveTest
 class ReanalyzeTest extends AbstractAnalysisTest {
+  Map<String, List<AnalysisError>> filesErrors = {};
+
+  @override
+  void processNotification(Notification notification) {
+    if (notification.event == ANALYSIS_ERRORS) {
+      var decoded = new AnalysisErrorsParams.fromNotification(notification);
+      filesErrors[decoded.file] = decoded.errors;
+    }
+  }
+
   test_reanalyze() {
     createProject();
     List<AnalysisContext> contexts = server.folderMap.values.toList();
@@ -34,4 +44,34 @@ class ReanalyzeTest extends AbstractAnalysisTest {
     AnalysisContext newContext = contexts[0];
     expect(newContext, isNot(same(oldContext)));
   }
+
+  test_reanalyze_with_overlay() {
+    createProject();
+    resourceProvider.newFolder(testFolder);
+    resourceProvider.newFile(testFile, 'main() {}');
+    return waitForTasksFinished().then((_) {
+      // Update the content with an overlay that contains a syntax error.
+      server.updateContent('1', {
+        testFile: new AddContentOverlay('main() {')
+      });
+      return waitForTasksFinished();
+    }).then((_) {
+      // Verify that the syntax error was detected.
+      List<AnalysisError> errors = filesErrors[testFile];
+      expect(errors, hasLength(1));
+      // Remove testFile from filesErrors so that we'll notice when the file is
+      // re-analyzed.
+      filesErrors.remove(testFile);
+      // Reanalyze.
+      server.reanalyze();
+      return waitForTasksFinished();
+    }).then((_) {
+      // The file should have been reanalyzed.
+      expect(filesErrors, contains(testFile));
+      // Verify that the syntax error is present (this indicates that the
+      // content introduced by the call to updateContent is still in effect).
+      List<AnalysisError> errors = filesErrors[testFile];
+      expect(errors, hasLength(1));
+    });
+  }
 }