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

chrome/test/data/pdf/params_parser_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.
 
 var tests = [
   /**
    * Test named destinations.
    */
   function testParamsParser() {
     var paramsParser = new OpenPDFParamsParser();
     // Assigning page number for #nameddests.
     paramsParser.namedDestinations['RU'] = 26;
     paramsParser.namedDestinations['US'] = 0;
     paramsParser.namedDestinations['UY'] = 22;
 
     var url = "http://xyz.pdf";
 
     // Checking #nameddest.
-    var urlParams = paramsParser.getViewportFromUrlParams(url + "#RU");
-    chrome.test.assertEq(urlParams.page, 26);
+    paramsParser.getViewportFromUrlParams(
+        url + "#RU", function(viewportPosition) {
+          chrome.test.assertEq(viewportPosition.page, 26);
+    });
 
     // Checking #nameddest=name.
-    urlParams = paramsParser.getViewportFromUrlParams(url + "#nameddest=US");
-    chrome.test.assertEq(urlParams.page, 0);
+    paramsParser.getViewportFromUrlParams(
+        url + "#nameddest=US", function(viewportPosition) {
+          chrome.test.assertEq(viewportPosition.page, 0);
+    });
 
     // Checking #page=pagenum nameddest.The document first page has a pagenum
     // value of 1.
-    urlParams = paramsParser.getViewportFromUrlParams(url + "#page=6");
-    chrome.test.assertEq(urlParams.page, 5);
+    paramsParser.getViewportFromUrlParams(
+        url + "#page=6", function(viewportPosition) {
+          chrome.test.assertEq(viewportPosition.page, 5);
+    });
 
     // Checking #zoom=scale.
-    urlParams = paramsParser.getViewportFromUrlParams(url + "#zoom=200");
-    chrome.test.assertEq(urlParams.zoom, 2);
+    paramsParser.getViewportFromUrlParams(
+        url + "#zoom=200", function(viewportPosition) {
+          chrome.test.assertEq(viewportPosition.zoom, 2);
+    });
 
     // Checking #zoom=scale,left,top.
-    urlParams = paramsParser.getViewportFromUrlParams(url +
-        "#zoom=200,100,200");
-    chrome.test.assertEq(urlParams.zoom, 2);
-    chrome.test.assertEq(urlParams.position.x, 100);
-    chrome.test.assertEq(urlParams.position.y, 200);
+    paramsParser.getViewportFromUrlParams(
+        url + "#zoom=200,100,200", function(viewportPosition) {
+          chrome.test.assertEq(viewportPosition.zoom, 2);
+          chrome.test.assertEq(viewportPosition.position.x, 100);
+          chrome.test.assertEq(viewportPosition.position.y, 200);
+    });
 
     // Checking #nameddest=name and zoom=scale.
-    urlParams = paramsParser.getViewportFromUrlParams(url +
-        "#nameddest=UY&zoom=150");
-    chrome.test.assertEq(urlParams.page, 22);
-    chrome.test.assertEq(urlParams.zoom, 1.5);
+    paramsParser.getViewportFromUrlParams(
+        url + "#nameddest=UY&zoom=150", function(viewportPosition) {
+          chrome.test.assertEq(viewportPosition.page, 22);
+          chrome.test.assertEq(viewportPosition.zoom, 1.5);
+    });
 
     // Checking #page=pagenum and zoom=scale.
-    urlParams = paramsParser.getViewportFromUrlParams(url +
-        "#page=2&zoom=250");
-    chrome.test.assertEq(urlParams.page, 1);
-    chrome.test.assertEq(urlParams.zoom, 2.5);
+    paramsParser.getViewportFromUrlParams(
+        url + "#page=2&zoom=250", function(viewportPosition) {
+          chrome.test.assertEq(viewportPosition.page, 1);
+          chrome.test.assertEq(viewportPosition.zoom, 2.5);
+    });
 
     // Checking #nameddest=name and zoom=scale,left,top.
-    urlParams = paramsParser.getViewportFromUrlParams(url +
-        "#nameddest=UY&zoom=150,100,200");
-    chrome.test.assertEq(urlParams.page, 22);
-    chrome.test.assertEq(urlParams.zoom, 1.5);
-    chrome.test.assertEq(urlParams.position.x, 100);
-    chrome.test.assertEq(urlParams.position.y, 200);
+    paramsParser.getViewportFromUrlParams(
+        url + "#nameddest=UY&zoom=150,100,200", function(viewportPosition) {
+          chrome.test.assertEq(viewportPosition.page, 22);
+          chrome.test.assertEq(viewportPosition.zoom, 1.5);
+          chrome.test.assertEq(viewportPosition.position.x, 100);
+          chrome.test.assertEq(viewportPosition.position.y, 200);
+    });
 
     // Checking #page=pagenum and zoom=scale,left,top.
-    urlParams = paramsParser.getViewportFromUrlParams(url +
-        "#page=2&zoom=250,100,200");
-    chrome.test.assertEq(urlParams.page, 1);
-    chrome.test.assertEq(urlParams.zoom, 2.5);
-    chrome.test.assertEq(urlParams.position.x, 100);
-    chrome.test.assertEq(urlParams.position.y, 200);
-
+    paramsParser.getViewportFromUrlParams(
+        url + "#page=2&zoom=250,100,200", function(viewportPosition) {
+          chrome.test.assertEq(viewportPosition.page, 1);
+          chrome.test.assertEq(viewportPosition.zoom, 2.5);
+          chrome.test.assertEq(viewportPosition.position.x, 100);
+          chrome.test.assertEq(viewportPosition.position.y, 200);
+    });
     chrome.test.succeed();
   }
 ];
 
 var scriptingAPI = new PDFScriptingAPI(window, window);
 scriptingAPI.setLoadCallback(function() {
   chrome.test.runTests(tests);
 });