<webview>: Zooming the embedder should zoom the guest by the same level.

chrome/browser/guest_view/web_view/chrome_web_view_guest_delegate.h

 // Copyright 2014 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_GUEST_VIEW_WEB_VIEW_CHROME_WEB_VIEW_GUEST_DELEGATE_H_
 #define CHROME_BROWSER_GUEST_VIEW_WEB_VIEW_CHROME_WEB_VIEW_GUEST_DELEGATE_H_
 
 #include "chrome/browser/extensions/api/web_view/chrome_web_view_internal_api.h"
+#include "chrome/browser/ui/zoom/zoom_observer.h"
 #include "extensions/browser/guest_view/web_view/web_view_guest.h"
 #include "extensions/browser/guest_view/web_view/web_view_guest_delegate.h"
 
 #if defined(OS_CHROMEOS)
 #include "chrome/browser/chromeos/accessibility/accessibility_manager.h"
 #endif
 
 class RenderViewContextMenu;
 
 namespace ui {
 class SimpleMenuModel;
 }  // namespace ui
 
-class ChromeWebViewGuestDelegate : public extensions::WebViewGuestDelegate {
+class ChromeWebViewGuestDelegate : public extensions::WebViewGuestDelegate,
+                                   public ZoomObserver {
  public :
   explicit ChromeWebViewGuestDelegate(
       extensions::WebViewGuest* web_view_guest);
   virtual ~ChromeWebViewGuestDelegate();
 
   // WebViewGuestDelegate implementation.
   virtual double GetZoom() OVERRIDE;
   virtual bool HandleContextMenu(
       const content::ContextMenuParams& params) OVERRIDE;
   virtual void OnAttachWebViewHelpers(content::WebContents* contents) OVERRIDE;
   virtual void OnEmbedderDestroyed() OVERRIDE;
+  virtual void OnDidAttachToEmbedder() OVERRIDE;
   virtual void OnDidCommitProvisionalLoadForFrame(bool is_main_frame) OVERRIDE;
   virtual void OnDidInitialize() OVERRIDE;
   virtual void OnDocumentLoadedInFrame(
       content::RenderFrameHost* render_frame_host) OVERRIDE;
   virtual void OnGuestDestroyed() OVERRIDE;
   virtual void OnSetZoom(double zoom_factor) OVERRIDE;
   virtual void OnShowContextMenu(
       int request_id,
       const MenuItemVector* items) OVERRIDE;
 
+  // ZoomObserver implementation.
+  virtual void OnZoomChanged(
+      const ZoomController::ZoomChangedEventData& data) OVERRIDE;
+
   extensions::WebViewGuest* web_view_guest() const { return web_view_guest_; }
 
  private:
   content::WebContents* guest_web_contents() const {
     return web_view_guest()->web_contents();
   }
 
   // Returns the top level items (ignoring submenus) as Value.
   static scoped_ptr<base::ListValue> MenuModelToValue(
       const ui::SimpleMenuModel& menu_model);
@@ skipping 26 matching lines @@
       accessibility_subscription_;
 #endif
 
   extensions::WebViewGuest* const web_view_guest_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeWebViewGuestDelegate);
 };
 
 #endif  // CHROME_BROWSER_GUEST_VIEW_WEB_VIEW_CHROME_WEB_VIEW_GUEST_DELEGATE_H_