Refactor browser window zoom handling and enable zoom icon on all platforms.

chrome/browser/ui/cocoa/toolbar/toolbar_controller.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_COCOA_TOOLBAR_TOOLBAR_CONTROLLER_H_
 #define CHROME_BROWSER_UI_COCOA_TOOLBAR_TOOLBAR_CONTROLLER_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include "base/memory/scoped_nsobject.h"
@@ skipping 108 matching lines @@
 // Updates the toolbar (and transitively the location bar) with the states of
 // the specified |tab|.  If |shouldRestore| is true, we're switching
 // (back?) to this tab and should restore any previous location bar state
 // (such as user editing) as well.
 - (void)updateToolbarWithContents:(content::WebContents*)tabForRestoring
                shouldRestoreState:(BOOL)shouldRestore;
 
 // Sets whether or not the current page in the frontmost tab is bookmarked.
 - (void)setStarredState:(BOOL)isStarred;
 
+// Happens when the zoom for the active tab changes, the active tab switches, or
+// a new tab or browser window is created. |canShowBubble| indicates if it is
+// appropriate to show a zoom bubble for the change.
+- (void)zoomChangedForActiveTab:(BOOL)canShowBubble;
+
 // Called to update the loading state. Handles updating the go/stop
 // button state.  |force| is set if the update is due to changing
 // tabs, as opposed to the page-load finishing.  See comment in
 // reload_button.h.
 - (void)setIsLoading:(BOOL)isLoading force:(BOOL)force;
 
 // Allow turning off the toolbar (but we may keep the location bar without a
 // surrounding toolbar). If |toolbar| is YES, the value of |hasLocationBar| is
 // ignored. This changes the behavior of other methods, like |-view|.
 - (void)setHasToolbar:(BOOL)toolbar hasLocationBar:(BOOL)locBar;
@@ skipping 42 matching lines @@
 // Returns an array of views in the order of the outlets above.
 - (NSArray*)toolbarViews;
 - (void)showOptionalHomeButton;
 - (void)installWrenchMenu;
 - (WrenchMenuController*)wrenchMenuController;
 // Return a hover button for the current event.
 - (NSButton*)hoverButtonForEvent:(NSEvent*)theEvent;
 @end
 
 #endif  // CHROME_BROWSER_UI_COCOA_TOOLBAR_TOOLBAR_CONTROLLER_H_