Fix for PDFs with lots of named destinations take a long time to load.

chrome/test/data/pdf/navigator_test.js

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 function NavigateInCurrentTabCallback() {
   this.navigateInCurrentTabCalled = false;
   this.callback = function() {
     this.navigateInCurrentTabCalled = true;
   }.bind(this);
   this.reset = function() {
@@ skipping 16 matching lines @@
    * Test navigation within the page, opening a url in the same tab and
    * opening a url in the new tab.
    */
   function testNavigate() {
     var mockWindow = new MockWindow(100, 100);
     var mockSizer = new MockSizer();
     var mockCallback = new MockViewportChangedCallback();
     var viewport = new Viewport(mockWindow, mockSizer, mockCallback.callback,
                                 function() {}, function() {}, 0, 0);
 
-    var paramsParser = new OpenPDFParamsParser();
-    paramsParser.namedDestinations['US'] = 0;
-    paramsParser.namedDestinations['UY'] = 2;
+    var paramsParser = new OpenPDFParamsParser(function(name) {
+      if (name == 'US')
+        paramsParser.onNamedDestinationReceived(0);
+      else if (name == 'UY')
+        paramsParser.onNamedDestinationReceived(2);
+      else
+        paramsParser.onNamedDestinationReceived(-1);
+    });
     var url = "http://xyz.pdf";
 
     var navigateInCurrentTabCallback = new NavigateInCurrentTabCallback();
     var navigateInNewTabCallback = new NavigateInNewTabCallback();
     var navigator = new Navigator(url, viewport, paramsParser,
         navigateInCurrentTabCallback.callback,
         navigateInNewTabCallback.callback);
 
     var documentDimensions = new MockDocumentDimensions();
     documentDimensions.addPage(100, 100);
@@ skipping 39 matching lines @@
     chrome.test.assertEq(300, viewport.position.y);
 
     chrome.test.succeed();
   }
 ];
 
 var scriptingAPI = new PDFScriptingAPI(window, window);
 scriptingAPI.setLoadCallback(function() {
   chrome.test.runTests(tests);
 });