Adds notification of when zoom level changes. I'm going to need this

chrome/common/notification_type.h

 // Copyright (c) 2010 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.
 
 #ifndef CHROME_COMMON_NOTIFICATION_TYPE_H_
 #define CHROME_COMMON_NOTIFICATION_TYPE_H_
 
 // This file describes various types used to describe and filter notifications
 // that pass through the NotificationService.
 //
@@ skipping 969 matching lines @@
 
     // The sync service is finished the configuration process.
     SYNC_CONFIGURE_DONE,
 
     // Cookies -----------------------------------------------------------------
 
     // Sent when a cookie changes. The source is a Profile object, the details
     // are a ChromeCookieDetails object.
     COOKIE_CHANGED,
 
+    // Misc --------------------------------------------------------------------
+
 #if defined(OS_CHROMEOS)
     // Sent when a chromium os user logs in.
     LOGIN_USER_CHANGED,
 
     // Sent when user image is updated.
     LOGIN_USER_IMAGE_CHANGED,
 
     // Sent when a chromium os user attempts to log in.  The source is
     // all and the details are AuthenticationNotificationDetails.
     LOGIN_AUTHENTICATION,
 
     // Sent when a panel state changed.
     PANEL_STATE_CHANGED,
 
     // Sent when the wizard's content view is destroyed. The source and details
     // are not used.
     WIZARD_CONTENT_VIEW_DESTROYED,
 #endif
 
     // Sent before the repost form warning is brought up.
     // The source is a NavigationController.
     REPOST_WARNING_SHOWN,
 
 #if defined(TOOLKIT_VIEWS)
     // Sent when a bookmark's context menu is shown. Used to notify
     // tests that the context menu has been created and shown.
     BOOKMARK_CONTEXT_MENU_SHOWN,
 #endif
 
+    // Sent when the zoom level changes. The source is the profile, details the
+    // host as a std::string.

[Peter Kasting, 2010/06/08 17:54:00]

Nit: You should probably give more detail here as the "host" may be a spec for
URLs that don't have a host (e.g. file: URLs).  I'd make a reference to some
comments on this elsewhere (since we note this in a few places already).

+    ZOOM_LEVEL_CHANGED,
+
     // Password Store ----------------------------------------------------------
     // This notification is sent whenenever login entries stored in the password
     // store are changed. The detail of this notification is a list of changes
     // represented by a vector of PasswordStoreChange. Each change includes a
     // change type (ADD, UPDATE, or REMOVE) as well as the
     // |webkit_glue::PasswordForm|s that were affected.
     LOGINS_CHANGED,
 
     // Count (must be last) ----------------------------------------------------
     // Used to determine the number of notification types.  Not valid as
@@ skipping 15 matching lines @@
 };
 
 inline bool operator==(NotificationType::Type a, NotificationType b) {
   return a == b.value;
 }
 inline bool operator!=(NotificationType::Type a, NotificationType b) {
   return a != b.value;
 }
 
 #endif  // CHROME_COMMON_NOTIFICATION_TYPE_H_