Don't include *.yaml files in 'analysis.analyzedFiles' notification.

pkg/analysis_server/test/analysis/notification_analyzedFiles_test.dart

Index: pkg/analysis_server/test/analysis/notification_analyzedFiles_test.dart
diff --git a/pkg/analysis_server/test/analysis/notification_analyzedFiles_test.dart b/pkg/analysis_server/test/analysis/notification_analyzedFiles_test.dart
index bddfea4d62426760c7c5b051a8f3db26d93706fb..c7a11964eaa754dce5b1c2a1154030116241d7d0 100644
--- a/pkg/analysis_server/test/analysis/notification_analyzedFiles_test.dart
+++ b/pkg/analysis_server/test/analysis/notification_analyzedFiles_test.dart
@@ -7,6 +7,7 @@ import 'dart:async';
 import 'package:analysis_server/protocol/protocol.dart';
 import 'package:analysis_server/protocol/protocol_constants.dart';
 import 'package:analysis_server/protocol/protocol_generated.dart';
+import 'package:analyzer/file_system/file_system.dart';
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
@@ -29,6 +30,11 @@ class AnalysisNotificationAnalyzedFilesTest extends AbstractAnalysisTest {
     expect(analyzedFiles, contains(filePath));
   }
 
+  void assertHasNoFile(String filePath) {
+    expect(analyzedFilesReceived, isTrue);
+    expect(analyzedFiles, isNot(contains(filePath)));
+  }
+
   Future<Null> prepareAnalyzedFiles() async {
     addGeneralAnalysisSubscription(GeneralAnalysisService.ANALYZED_FILES);
     await pumpEventQueue();
@@ -66,6 +72,19 @@ class A {}
     assertHasFile(testFile);
   }
 
+  test_beforeAnalysis_excludeYamlFiles() async {
+    File yamlFile = resourceProvider
+        .getFolder(projectPath)
+        .getChildAssumingFile('sample.yaml');
+    yamlFile.writeAsStringSync('');
+    addTestFile('''
+class A {}
+''');
+    await prepareAnalyzedFiles();
+    assertHasFile(testFile);
+    assertHasNoFile(yamlFile.path);
+  }
+
   test_insignificant_change() async {
     // Making a change that doesn't affect the set of reachable files should
     // not trigger the notification to be re-sent.