Add _embedder.yaml support to analyzer and analysis_server

pkg/analyzer/test/generated/engine_test.dart

Index: pkg/analyzer/test/generated/engine_test.dart
diff --git a/pkg/analyzer/test/generated/engine_test.dart b/pkg/analyzer/test/generated/engine_test.dart
index 6d04f133b93a74b129b690cb4422d5c01b0bfea1..ff4e1185bbe4bffe838f8ea449ede71a29285bee 100644
--- a/pkg/analyzer/test/generated/engine_test.dart
+++ b/pkg/analyzer/test/generated/engine_test.dart
@@ -8,6 +8,7 @@ import 'dart:async';
 import 'dart:collection';
 
 import 'package:analyzer/file_system/memory_file_system.dart';
+import 'package:analyzer/source/embedder.dart';
 import 'package:analyzer/src/cancelable_future.dart';
 import 'package:analyzer/src/context/cache.dart' show CacheEntry;
 import 'package:analyzer/src/generated/ast.dart';
@@ -5691,6 +5692,12 @@ class TestAnalysisContext implements InternalAnalysisContext {
   }
 
   @override
+  EmbedderYamlLocator get embedderYamlLocator {
+    fail("Unexpected invocation of get embedderYamlLocator");
+    return null;
+  }
+
+  @override
   void set analysisOptions(AnalysisOptions options) {
     fail("Unexpected invocation of setAnalysisOptions");
   }