Implement SearchEngine.searchMemberDeclarations() for the new driver.

pkg/analysis_server/lib/src/services/search/search_engine_internal2.dart

Index: pkg/analysis_server/lib/src/services/search/search_engine_internal2.dart
diff --git a/pkg/analysis_server/lib/src/services/search/search_engine_internal2.dart b/pkg/analysis_server/lib/src/services/search/search_engine_internal2.dart
index 5d740f8eaf158d710996069f940d4938e7a2b9fc..6a09cd9b4306b6b8821567d97d66614ded422828 100644
--- a/pkg/analysis_server/lib/src/services/search/search_engine_internal2.dart
+++ b/pkg/analysis_server/lib/src/services/search/search_engine_internal2.dart
@@ -38,8 +38,13 @@ class SearchEngineImpl2 implements SearchEngine {
 
   @override
   Future<List<SearchMatch>> searchMemberDeclarations(String name) async {
-    // TODO(scheglov) implement
-    return [];
+    List<SearchMatch> allDeclarations = [];
+    RegExp regExp = new RegExp('^$name\$');
+    for (AnalysisDriver driver in _drivers) {
+      List<Element> elements = await driver.search.classMembers(regExp);
+      allDeclarations.addAll(elements.map(_SearchMatch.forElement));
+    }
+    return allDeclarations;
   }
 
   @override
@@ -70,18 +75,7 @@ class SearchEngineImpl2 implements SearchEngine {
     RegExp regExp = new RegExp(pattern);
     for (AnalysisDriver driver in _drivers) {
       List<Element> elements = await driver.search.topLevelElements(regExp);
-      for (Element element in elements) {
-        allDeclarations.add(new _SearchMatch(
-            element.source.fullName,
-            element.librarySource,
-            element.source,
-            element.library,
-            element,
-            true,
-            true,
-            MatchKind.DECLARATION,
-            new SourceRange(element.nameOffset, element.nameLength)));
-      }
+      allDeclarations.addAll(elements.map(_SearchMatch.forElement));
     }
     return allDeclarations;
   }
@@ -168,6 +162,19 @@ class _SearchMatch implements SearchMatch {
         new SourceRange(result.offset, result.length));
   }
 
+  static _SearchMatch forElement(Element element) {
+    return new _SearchMatch(
+        element.source.fullName,
+        element.librarySource,
+        element.source,
+        element.library,
+        element,
+        true,
+        true,
+        MatchKind.DECLARATION,
+        new SourceRange(element.nameOffset, element.nameLength));
+  }
+
   static MatchKind toMatchKind(SearchResultKind kind) {
     if (kind == SearchResultKind.READ) {
       return MatchKind.READ;