Have analysis.getLibraryDependencies wait for the server.onAnalysisComplete completer

pkg/analysis_server/lib/src/domain_analysis.dart

Index: pkg/analysis_server/lib/src/domain_analysis.dart
diff --git a/pkg/analysis_server/lib/src/domain_analysis.dart b/pkg/analysis_server/lib/src/domain_analysis.dart
index 98097b4a6f02ae86592f5802538683bc0ba87146..01d1855ca67ed51bb6c4e407f06b80662eb0ff6c 100644
--- a/pkg/analysis_server/lib/src/domain_analysis.dart
+++ b/pkg/analysis_server/lib/src/domain_analysis.dart
@@ -90,12 +90,18 @@ class AnalysisDomainHandler implements RequestHandler {
 
   /// Implement the `analysis.getLibraryDependencies` request.
   Response getLibraryDependencies(Request request) {
-    LibraryDependencyCollector collector = new LibraryDependencyCollector(
-            server.getAnalysisContexts());
-    Set<String> libraries = collector.collectLibraryDependencies();
-    Map<String, Map<String, List<String>>> packageMap = collector.calculatePackageMap(server.folderMap);
-    return new AnalysisGetLibraryDependenciesResult(
-        libraries.toList(growable: false), packageMap).toResponse(request.id);
+    server.onAnalysisComplete.then((_) {
+      LibraryDependencyCollector collector =
+          new LibraryDependencyCollector(server.getAnalysisContexts());
+      Set<String> libraries = collector.collectLibraryDependencies();
+      Map<String, Map<String, List<String>>> packageMap =
+          collector.calculatePackageMap(server.folderMap);
+      server.sendResponse(new AnalysisGetLibraryDependenciesResult(
+          libraries.toList(growable: false),
+          packageMap).toResponse(request.id));
+    });
+    // delay response
+    return Response.DELAYED_RESPONSE;
   }
 
   @override