Add accessibility function to PDFScriptingAPI

chrome/test/data/pdf/basic_plugin_test.js

 // Copyright 2014 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.
 
 /**
  * These tests require that the PDF plugin be available to run correctly.
  */
 var tests = [
   /**
    * Test that the page is sized to the size of the document.
    */
   function testPageSize() {
     // Verify that the initial zoom is 100%.
     chrome.test.assertEq(1, viewer.viewport.zoom);
 
     var sizer = document.getElementById('sizer');
     chrome.test.assertEq(826, sizer.offsetWidth);
     chrome.test.assertEq(1066, sizer.offsetHeight);
     chrome.test.succeed();
   },
+
+  function testAccessibility() {
+    var client = new PDFScriptingAPI(window, window.location.origin);
+    client.setDestinationWindow(window);
+    client.getAccessibilityJSON(chrome.test.callbackPass(function(json) {
+      chrome.test.assertEq('{"copyable":true,"loaded":true,"numberOfPages":1}',
+                           json);
+    }));
+  },
+
+  function testAccessibilityWithPage() {
+    var client = new PDFScriptingAPI(window, window.location.origin);
+    client.setDestinationWindow(window);
+    client.getAccessibilityJSON(chrome.test.callbackPass(function(json) {
+      var dict = JSON.parse(json);
+      chrome.test.assertEq(612, dict.width);
+      chrome.test.assertEq(792, dict.height);
+      chrome.test.assertEq(1.0, dict.textBox[0].fontSize);
+      chrome.test.assertEq('text', dict.textBox[0].textNodes[0].type);
+      chrome.test.assertEq('this is some text',
+                           dict.textBox[0].textNodes[0].text);
+      chrome.test.assertEq(1.0, dict.textBox[1].fontSize);
+      chrome.test.assertEq('text', dict.textBox[1].textNodes[0].type);
+      chrome.test.assertEq('some more text',
+                           dict.textBox[1].textNodes[0].text);
+    }), 0);
+  }
 ];
 
 window.addEventListener('pdfload', function() {
   chrome.test.runTests(tests);
 });