PDFs viewed inside a <webview> should navigate the same as PDFs in tabs.

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.navigateCalled = false;
   this.url = undefined;
   this.callback = function(url) {
     this.navigateCalled = true;
     this.url = url;
@@ skipping 72 matching lines @@
         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,
+    var navigator = new Navigator(0, url, viewport, paramsParser,
         navigateInCurrentTabCallback.callback,
         navigateInNewTabCallback.callback);
 
     var documentDimensions = new MockDocumentDimensions();
     documentDimensions.addPage(100, 100);
     documentDimensions.addPage(200, 200);
     documentDimensions.addPage(100, 400);
     viewport.setDocumentDimensions(documentDimensions);
     viewport.setZoom(1);
 
@@ skipping 47 matching lines @@
     var viewport = new Viewport(mockWindow, mockSizer, mockCallback.callback,
                                 function() {}, function() {}, 0, 1, 0);
 
     var paramsParser = new OpenPDFParamsParser(function(name) {
       paramsParser.onNamedDestinationReceived(-1);
     });
     var url = "http://www.example.com/subdir/xyz.pdf";
 
     var navigateInCurrentTabCallback = new NavigateInCurrentTabCallback();
     var navigateInNewTabCallback = new NavigateInNewTabCallback();
-    var navigator = new Navigator(url, viewport, paramsParser,
+    var navigator = new Navigator(0, url, viewport, paramsParser,
         navigateInCurrentTabCallback.callback,
         navigateInNewTabCallback.callback);
 
     // Sanity check.
     doNavigationUrlTestInCurrentTabAndNewTab(
         navigator,
         'https://www.foo.com/bar.pdf',
         'https://www.foo.com/bar.pdf',
         mockCallback,
         navigateInCurrentTabCallback,
@@ skipping 86 matching lines @@
     var viewport = new Viewport(mockWindow, mockSizer, mockCallback.callback,
                                 function() {}, function() {}, 0, 1, 0);
 
     var paramsParser = new OpenPDFParamsParser(function(name) {
       paramsParser.onNamedDestinationReceived(-1);
     });
     var url = "file:///some/path/to/myfile.pdf";
 
     var navigateInCurrentTabCallback = new NavigateInCurrentTabCallback();
     var navigateInNewTabCallback = new NavigateInNewTabCallback();
-    var navigator = new Navigator(url, viewport, paramsParser,
+    var navigator = new Navigator(0, url, viewport, paramsParser,
         navigateInCurrentTabCallback.callback,
         navigateInNewTabCallback.callback);
 
     // Open an absolute link.
     doNavigationUrlTestInCurrentTabAndNewTab(
         navigator,
         '/foodotcom/bar.pdf',
         'file:///foodotcom/bar.pdf',
         mockCallback,
         navigateInCurrentTabCallback,
         navigateInNewTabCallback);
 
     chrome.test.succeed();
   }
 ];
 
 var scriptingAPI = new PDFScriptingAPI(window, window);
 scriptingAPI.setLoadCallback(function() {
   chrome.test.runTests(tests);
 });