content: convert zoom notifications to observer usage

chrome/browser/ui/gtk/browser_toolbar_gtk.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_GTK_BROWSER_TOOLBAR_GTK_H_
 #define CHROME_BROWSER_UI_GTK_BROWSER_TOOLBAR_GTK_H_
 
 #include <gtk/gtk.h>
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/prefs/public/pref_member.h"
 #include "chrome/browser/command_observer.h"
 #include "chrome/browser/ui/gtk/custom_button.h"
 #include "chrome/browser/ui/gtk/menu_gtk.h"
 #include "chrome/browser/ui/toolbar/wrench_menu_model.h"
+#include "content/public/browser/host_zoom_map.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "ui/base/accelerators/accelerator.h"
 #include "ui/base/gtk/gtk_signal.h"
 #include "ui/base/gtk/gtk_signal_registrar.h"
 #include "ui/base/gtk/owned_widget_gtk.h"
 #include "ui/base/models/simple_menu_model.h"
 
 class BackForwardButtonGtk;
 class Browser;
 class BrowserActionsToolbarGtk;
 class BrowserWindowGtk;
 class CustomDrawButton;
 class GtkThemeService;
 class LocationBar;
 class LocationBarViewGtk;
 class ReloadButtonGtk;
 class ToolbarModel;
 
 namespace content {
 class WebContents;
 }
 
 // View class that displays the GTK version of the toolbar and routes gtk
 // events back to the Browser.
 class BrowserToolbarGtk : public CommandObserver,
                           public ui::AcceleratorProvider,
                           public MenuGtk::Delegate,
+                          public content::HostZoomMap::Observer,
                           public content::NotificationObserver {
  public:
   BrowserToolbarGtk(Browser* browser, BrowserWindowGtk* window);
   virtual ~BrowserToolbarGtk();
 
   // Create the contents of the toolbar. |top_level_window| is the GtkWindow
   // to which we attach our accelerators.
   void Init(GtkWindow* top_level_window);
 
   // Set the various widgets' ViewIDs.
@@ skipping 36 matching lines @@
   // Overridden from MenuGtk::Delegate:
   virtual void StoppedShowing() OVERRIDE;
   virtual GtkIconSet* GetIconSetForId(int idr) OVERRIDE;
   virtual bool AlwaysShowIconForCmd(int command_id) const OVERRIDE;
 
   // Overridden from ui::AcceleratorProvider:
   virtual bool GetAcceleratorForCommandId(
       int id,
       ui::Accelerator* accelerator) OVERRIDE;
 
+  // content::HostZoomMap::Observer implementation:
+  virtual void OnZoomLevelChanged(const std::string& host) OVERRIDE;
+
   // content::NotificationObserver implementation.
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
   // Whether the wrench/hotdogs menu is currently visible to the user.
   bool IsWrenchMenuShowing() const;
 
   // Message that we should react to a state change.
   void UpdateWebContents(content::WebContents* contents,
@@ skipping 105 matching lines @@
   // rendering.
   ui::OwnedWidgetGtk offscreen_entry_;
 
   // Manages the home button drop signal handler.
   scoped_ptr<ui::GtkSignalRegistrar> drop_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserToolbarGtk);
 };
 
 #endif  // CHROME_BROWSER_UI_GTK_BROWSER_TOOLBAR_GTK_H_