Implemented explicit resizing from guestview.

extensions/test/data/web_view/apitest/main.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.
 
 var embedder = {};
 
 // TODO(lfg) Move these functions to a common js.
 embedder.setUp_ = function(config) {
   if (!config || !config.testServer) {
     return;
@@ skipping 147 matching lines @@
 
 // Makes sure 'sizechanged' event is fired only if autosize attribute is
 // specified.
 // After loading <webview> without autosize attribute and a size, say size1,
 // we set autosize attribute and new min size with size2. We would get (only
 // one) sizechanged event with size1 as old size and size2 as new size.
 function testAutosizeAfterNavigation() {
   var webview = document.createElement('webview');
 
   var step = 1;
+  var autosizeWidth = -1;
+  var autosizeHeight = -1;
   var sizeChangeHandler = function(e) {
     switch (step) {
       case 1:
         // This would be triggered after we set autosize attribute.
         embedder.test.assertEq(50, e.oldWidth);
         embedder.test.assertEq(100, e.oldHeight);
         embedder.test.assertTrue(e.newWidth >= 60 && e.newWidth <= 70);
         embedder.test.assertTrue(e.newHeight >= 110 && e.newHeight <= 120);
 
-        // Remove autosize attribute and expect webview to return to its
-        // original size.
+        // Remove autosize attribute and expect webview to retain the same size.
+        autosizeWidth = e.newWidth;
+        autosizeHeight = e.newHeight;
         webview.removeAttribute('autosize');
         break;
       case 2:
-        // Expect 50x100.
-        embedder.test.assertEq(50, e.newWidth);
-        embedder.test.assertEq(100, e.newHeight);
+        // Expect the autosized size.
+        embedder.test.assertEq(autosizeWidth, e.newWidth);
+        embedder.test.assertEq(autosizeHeight, e.newHeight);
 
         embedder.test.succeed();
         break;
       default:
         window.console.log('Unexpected sizechanged event, step = ' + step);
         embedder.test.fail();
         break;
     }
 
     ++step;
@@ skipping 1538 matching lines @@
   'testWebRequestAPIExistence': testWebRequestAPIExistence,
   'testWebRequestAPIGoogleProperty': testWebRequestAPIGoogleProperty
 };
 
 onload = function() {
   chrome.test.getConfig(function(config) {
     embedder.setUp_(config);
     chrome.test.sendMessage('LAUNCHED');
   });
 };