Zoom Extension API

chrome/test/data/extensions/api_test/tabs/basics/events.js

 // Copyright (c) 2012 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 testTabId;
 var otherTabId;
 var firstWindowId;
 var secondWindowId;
 
 chrome.test.runTests([
@@ skipping 137 matching lines @@
           callback();
       });
       chrome.tabs.move(tabId, properties);
     };
 
     // Move tab to second window, then back to first.
     moveAndListen(testTabId, firstWindowId, 1,
                   {"windowId": secondWindowId, "index": 0}, pass(function() {
       moveAndListen(testTabId, secondWindowId, 0,
                     {"windowId": firstWindowId, "index": 1});
-    }));
+                  }));
+  },
+
+  function tabsOnZoomChange() {
+    chrome.tabs.setZoom(testTabId, 1, function() {
+      chrome.test.listenOnce(
+          chrome.tabs.onZoomChange,
+          function(tabId, oldZoomFactor, newZoomFactor, zoomSettings) {
+            assertEq(testTabId, tabId);
+            assertEq(1, oldZoomFactor);
+            assertEq(3.14159, +newZoomFactor.toFixed(5));
+            assertEq(zoomSettings.mode, "automatic");
+            assertEq(zoomSettings.scope, "per-origin");
+          });
+
+      chrome.tabs.setZoom(testTabId, 3.14159);
+    });
   },
 
   function windowsOnCreated() {
     chrome.test.listenOnce(chrome.windows.onCreated, function(window) {
       assertTrue(window.width > 0);
       assertTrue(window.height > 0);
       assertEq("normal", window.type);
       assertTrue(!window.incognito);
       windowEventsWindow = window;
       chrome.tabs.getAllInWindow(window.id, pass(function(tabs) {
@@ skipping 21 matching lines @@
               assertEq(windowEventsWindow.id, changedWindowId);
             });
             chrome.windows.remove(windowB.id);
           }));
         }));
       }));
     }));
   }
   */
 ]);