Changes to content/ to facilitate new zoom extension API

content/public/browser/web_contents_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 CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_OBSERVER_H_
 #define CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_OBSERVER_H_
 
 #include "base/process/kill.h"
 #include "base/process/process_handle.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/navigation_controller.h"
 #include "content/public/common/frame_navigate_params.h"
 #include "content/public/common/page_transition_types.h"
+#include "content/public/common/page_zoom.h"
 #include "ipc/ipc_listener.h"
 #include "ipc/ipc_sender.h"
 #include "ui/base/window_open_disposition.h"
 
 namespace content {
 
 class NavigationEntry;
 class RenderFrameHost;
 class RenderViewHost;
 class WebContents;
@@ skipping 288 matching lines @@
   // Invoked when the renderer has toggled the tab into/out of fullscreen mode.
   virtual void DidToggleFullscreenModeForTab(bool entered_fullscreen) {}
 
   // Invoked when visible SSL state (as defined by SSLStatus) changes.
   virtual void DidChangeVisibleSSLState() {}
 
   // Invoked when an interstitial page is attached or detached.
   virtual void DidAttachInterstitialPage() {}
   virtual void DidDetachInterstitialPage() {}
 
+  // Invoked when a zoom change is initiated from WebContents::SetZoomLevel().
+  virtual void DidSetZoomLevel(int old_zoom_level,
+                               int new_zoom_level,
+                               ZoomMode zoom_mode) {}
+
   // Invoked before a form repost warning is shown.
   virtual void BeforeFormRepostWarningShow() {}
 
   // Invoked when the beforeunload handler fires. The time is from the renderer.
   virtual void BeforeUnloadFired(const base::TimeTicks& proceed_time) {}
 
   // Invoked when a user cancels a before unload dialog.
   virtual void BeforeUnloadDialogCancelled() {}
 
   // Invoked when an accessibility event is received from the renderer.
@@ skipping 32 matching lines @@
   void WebContentsImplDestroyed();
 
   WebContentsImpl* web_contents_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsObserver);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_OBSERVER_H_