Revert "Remove unused option in server API"

pkg/analysis_server/test/mocks.dart

Index: pkg/analysis_server/test/mocks.dart
diff --git a/pkg/analysis_server/test/mocks.dart b/pkg/analysis_server/test/mocks.dart
index 0f00b66cc531c3c9d87e0b3b0ef99281e4c5df75..3d719e33b878a8f36a239361b514d0063e70be6f 100644
--- a/pkg/analysis_server/test/mocks.dart
+++ b/pkg/analysis_server/test/mocks.dart
@@ -14,6 +14,10 @@ import 'package:analysis_server/src/channel/channel.dart';
 import 'package:analysis_server/src/operation/operation.dart';
 import 'package:analysis_server/src/operation/operation_analysis.dart';
 import 'package:analyzer/dart/element/element.dart';
+import 'package:analyzer/file_system/file_system.dart' as resource;
+import 'package:analyzer/file_system/memory_file_system.dart' as resource;
+import 'package:analyzer/source/package_map_provider.dart';
+import 'package:analyzer/source/pub_package_map_provider.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/source.dart';
 import 'package:typed_mock/typed_mock.dart';
@@ -124,6 +128,46 @@ class MockMethodElement extends StringTypedMock implements MethodElement {
   MockMethodElement([String name = 'method']) : super(name);
 }
 
+/**
+ * A mock [PackageMapProvider].
+ */
+class MockPackageMapProvider implements PubPackageMapProvider {
+  /**
+   * Package map that will be returned by the next call to [computePackageMap].
+   */
+  Map<String, List<resource.Folder>> packageMap =
+      <String, List<resource.Folder>>{};
+
+  /**
+   * Package maps that will be returned by the next call to [computePackageMap].
+   */
+  Map<String, Map<String, List<resource.Folder>>> packageMaps = null;
+
+  /**
+   * Dependency list that will be returned by the next call to [computePackageMap].
+   */
+  Set<String> dependencies = new Set<String>();
+
+  /**
+   * Number of times [computePackageMap] has been called.
+   */
+  int computeCount = 0;
+
+  @override
+  PackageMapInfo computePackageMap(resource.Folder folder) {
+    ++computeCount;
+    if (packageMaps != null) {
+      return new PackageMapInfo(packageMaps[folder.path], dependencies);
+    }
+    return new PackageMapInfo(packageMap, dependencies);
+  }
+
+  noSuchMethod(Invocation invocation) {
+    // No other methods should be called.
+    return super.noSuchMethod(invocation);
+  }
+}
+
 class MockParameterElement extends TypedMock implements ParameterElement {
   final ElementKind kind = ElementKind.PARAMETER;
 }