display completion performance in new server status page

pkg/analysis_server/lib/src/domain_completion.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library domain.completion;
 
 import 'package:analysis_server/src/analysis_server.dart';
 import 'package:analysis_server/src/constants.dart';
 import 'package:analysis_server/src/protocol.dart';
 import 'package:analysis_server/src/services/completion/completion_manager.dart';
 
 /**
  * Instances of the class [CompletionDomainHandler] implement a [RequestHandler]
  * that handles requests in the search domain.
  */
 class CompletionDomainHandler implements RequestHandler {
   /**
    * The analysis server that is using this handler to process requests.
    */
   final AnalysisServer server;
 
   /**
    * The next completion response id.
    */
   int _nextCompletionId = 0;
 
   /**
+   * Code completion peformance for the last completion operation.
+   */
+  CompletionPerformance performance;
+
+  /**
    * Initialize a new request handler for the given [server].
    */
   CompletionDomainHandler(this.server);
 
   @override
   Response handleRequest(Request request) {
     try {
       String requestName = request.method;
       if (requestName == COMPLETION_GET_SUGGESTIONS) {
         return processRequest(request);
       }
     } on RequestFailure catch (exception) {
       return exception.response;
     }
     return null;
   }
 
   /**
    * Process a `completion.getSuggestions` request.
    */
   Response processRequest(Request request) {
+    performance = new CompletionPerformance();
     // extract params
-    var params = new CompletionGetSuggestionsParams.fromRequest(request);
+    CompletionGetSuggestionsParams params =
+        new CompletionGetSuggestionsParams.fromRequest(request);
     // schedule completion analysis
     String completionId = (_nextCompletionId++).toString();
     CompletionManager.create(
         server.getAnalysisContext(params.file),
         server.getSource(params.file),
         params.offset,
-        server.searchEngine).results().listen((CompletionResult result) {
+        server.searchEngine,
+        performance).results().listen((CompletionResult result) {
       sendCompletionNotification(
           completionId,
           result.replacementOffset,
           result.replacementLength,
           result.suggestions,
           result.last);
+      if (result.last) {
+        performance.complete();
+      }
     });
     // initial response without results
-    return new CompletionGetSuggestionsResult(completionId).toResponse(
-        request.id);
+    return new CompletionGetSuggestionsResult(
+        completionId).toResponse(request.id);
   }
 
   /**
    * Send completion notification results.
    */
   void sendCompletionNotification(String completionId, int replacementOffset,
       int replacementLength, Iterable<CompletionSuggestion> results, bool isLast) {
-    server.sendNotification(new CompletionResultsParams(completionId,
-        replacementOffset, replacementLength, results, isLast).toNotification());
+    server.sendNotification(
+        new CompletionResultsParams(
+            completionId,
+            replacementOffset,
+            replacementLength,
+            results,
+            isLast).toNotification());
   }
 }