update completion sorter to new API

pkg/analysis_server/test/services/completion/common_usage_computer_test.dart

 // Copyright (c) 2015, 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 test.services.completion.computer.dart.relevance;
 
 import 'dart:async';
 
 import 'package:analysis_server/plugin/protocol/protocol.dart';
 import 'package:analysis_server/src/analysis_server.dart'
@@ skipping 154 matching lines @@
     expect(replacementOffset, equals(completionOffset));
     expect(replacementLength, equals(0));
     assertHasResult(CompletionSuggestionKind.INVOCATION, 's1');
     assertHasResult(
         CompletionSuggestionKind.INVOCATION, 's2', DART_RELEVANCE_COMMON_USAGE);
     assertNoResult('Future');
     assertNoResult('Object');
     assertNoResult('A');
   }
 
+  test_PrefixedIdentifier_field_inPart() async {
+    // SimpleIdentifier  PrefixedIdentifeir  ExpressionStatement
+    addFile('/project/bin/myLib.dart',
+        'library L; part "$testFile"; class A {static int s2;}');
+    addTestFile('part of L; foo() {A.^}');
+    await getSuggestions({
+      'L.A': ['s2']
+    });
+    expect(replacementOffset, equals(completionOffset));
+    expect(replacementLength, equals(0));
+    assertHasResult(
+        CompletionSuggestionKind.INVOCATION, 's2', DART_RELEVANCE_COMMON_USAGE);
+    assertNoResult('Future');
+    assertNoResult('Object');
+    assertNoResult('A');
+  }
+
   test_PrefixedIdentifier_getter() async {
     // SimpleIdentifier  PrefixedIdentifeir  ExpressionStatement
     addTestFile('class A {int get g1 => 1; int get g2 => 2; x() {new A().^}}');
     await getSuggestions({
       '.A': ['g2']
     });
     expect(replacementOffset, equals(completionOffset));
     expect(replacementLength, equals(0));
     assertHasResult(CompletionSuggestionKind.INVOCATION, 'g1');
     assertHasResult(
@@ skipping 45 matching lines @@
     assertHasResult(CompletionSuggestionKind.INVOCATION, 'nextBool');
     assertHasResult(CompletionSuggestionKind.INVOCATION, 'nextDouble',
         DART_RELEVANCE_COMMON_USAGE - 1);
     assertHasResult(CompletionSuggestionKind.INVOCATION, 'nextInt',
         DART_RELEVANCE_COMMON_USAGE);
     assertNoResult('Random');
     assertNoResult('Object');
     assertNoResult('A');
   }
 }