Implement "go to page" functionality in out of process PDF

chrome/browser/resources/pdf/pdf.js

 // Copyright 2013 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() {
 'use strict';
 
 <include src="../../../../ui/webui/resources/js/util.js"></include>
 <include src="viewport.js"></include>
 
@@ skipping 31 matching lines @@
   viewerProgressBar.progress = progress;
   if (progress == -1) {
     // Document load failed.
     sizer.style.display = 'none';
     viewerToolbar.style.visibility = 'hidden';
   }
 }
 
 // Called when a message is received from the plugin.
 function handleMessage(message) {
-  if (message.data.type == 'documentDimensions') {
-    documentDimensions = message.data;
-    viewport.setDocumentDimensions(documentDimensions);
-    viewerToolbar.style.visibility = 'visible';
-    viewerPageIndicator.initialFadeIn();
-    viewerToolbar.initialFadeIn();
-  } else if (message.data.type == 'loadProgress') {
-    updateProgress(message.data['progress']);
+  switch (message.data.type.toString()) {
+    case 'documentDimensions':
+      documentDimensions = message.data;
+      viewport.setDocumentDimensions(documentDimensions);
+      viewerToolbar.style.visibility = 'visible';
+      viewerPageIndicator.initialFadeIn();
+      viewerToolbar.initialFadeIn();
+      break;
+    case 'loadProgress':
+      updateProgress(message.data.progress);
+      break;
+    case 'goToPage':
+      viewport.goToPage(message.data.page);
+      break;
   }
 }
 
 // Callback that's called when the viewport changes.
 function viewportChangedCallback(zoom,
                                  x,
                                  y,
                                  scrollbarWidth,
                                  hasScrollbars,
                                  page) {
@@ skipping 86 matching lines @@
           e.preventDefault();
         }
         return;
     }
   };
 }
 
 load();
 
 })();