Zoom Extension API

chrome/browser/ui/tabs/tab_strip_model_observer.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_TABS_TAB_STRIP_MODEL_OBSERVER_H_
 #define CHROME_BROWSER_UI_TABS_TAB_STRIP_MODEL_OBSERVER_H_
 
+#include "content/public/common/page_zoom.h"
+
 class TabStripModel;
 
 namespace content {
 class WebContents;
 }
 
 namespace ui {
 class ListSelectionModel;
 }
 
@@ skipping 125 matching lines @@
 
   // The TabStripModel now no longer has any tabs. The implementer may
   // use this as a trigger to try and close the window containing the
   // TabStripModel, for example...
   virtual void TabStripEmpty();
 
   // Sent when the tabstrip model is about to be deleted and any reference held
   // must be dropped.
   virtual void TabStripModelDeleted();
 
+  // A zoom change has been initiated in a tab.
+  virtual void TabZoomChange(content::WebContents* contents,
+                             double old_zoom_level,
+                             double new_zoom_level,
+                             content::ZoomMode zoom_mode);
+
  protected:
   virtual ~TabStripModelObserver() {}
 };
 
 #endif  // CHROME_BROWSER_UI_TABS_TAB_STRIP_MODEL_OBSERVER_H_